Relevant bibliographies by topics / 1H NMR- analysis

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic '1H NMR- analysis'

Author: Grafiati
Published: 7 June 2025
Last updated: 2 August 2025

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Journal articles on the topic "1H NMR- analysis"

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Kim, Jongphil, Hin Kyeol Woo, Dixon Vimalajeewa, and Brani Vidakovic. "Analysis and classification of 1H-NMR spectra by multifractal analysis." PLOS ONE 18, no. 6 (2023): e0286205. http://dx.doi.org/10.1371/journal.pone.0286205.

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The objective of this research focuses on the development of a statistical methodology able to answer the question of whether variation in the intake of sulfur amino acids (SAA) affects the metabolic process. Traditional approaches, which evaluate specific biomarkers after a series of preprocessing procedures, have been criticized as not being fully informative, as well as inappropriate for translation of methodology. Rather than focusing on particular biomarkers, our proposed methodology involves the multifractal analysis that measures the inhomogeneity of regularity of the proton nuclear mag
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Penchev, Plamen N., Stefka R. Nachkova, Tonka A. Vasileva, and Petko I. Bozov. "1H and 13C NMR Analysis of the neo-Clerodane Diterpenoid Scutecyprin." Natural Product Communications 9, no. 8 (2014): 1934578X1400900. http://dx.doi.org/10.1177/1934578x1400900803.

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The 1H and 13C NMR spectra of the neo-clerodane diterpenoid scutecyprin were completely assigned by using a combination of 2D NMR experiments, which included 1H-1H COSY, HSQC, HMBC and NOESY sequences.
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Le Mao, Inès, Grégory Da Costa, and Tristan Richard. "<sup>1</sup>H-NMR metabolomics for wine screening and analysis." OENO One 57, no. 1 (2023): 15–31. http://dx.doi.org/10.20870/oeno-one.2023.57.1.7134.

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The number of metabolomic studies has grown steadily over the last twenty years. Among the fields of application, food sciences are broadly represented. Proton NMR (1H-NMR) is a commonly used technique for metabolomics and is particularly suitable for wine analysis, because the major wine constituents are highly dependent on biotic and abiotic conditions. 1H-NMR-based metabolomics were used first to guarantee the authenticity of wines, and more recently to determine the impact of viticultural or oenological practices using both targeted and untargeted protocols. This state-of-the-art review co
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Clemente, Joyce S., Edward G. Gregorich, André J. Simpson, Rajeev Kumar, Denis Courtier-Murias, and Myrna J. Simpson. "Comparison of nuclear magnetic resonance methods for the analysis of organic matter composition from soil density and particle fractions." Environmental Chemistry 9, no. 1 (2012): 97. http://dx.doi.org/10.1071/en11096.

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Environmental contextThe association of specific organic matter (OM) compounds with clay mineral surfaces is believed to protect these compounds from degradation and thus result in long-term protection in soil. The molecular-level composition of soil OM associated with soil fractions was measured and compared using solid-state 13C nuclear magnetic resonance (NMR) and solution-state 1H NMR methods. Combining these methods allowed more detailed characterisation of OM associated with different soil fractions and will improve the understanding of OM dynamics in soil. AbstractOrganic matter (OM) as
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Porzel, Andrea, Volker Marquardt, Günter Adam, Georges Massiot, and Dieter Zeigan. "1H and13C NMR analysis of brassinosteroids." Magnetic Resonance in Chemistry 30, no. 7 (1992): 651–57. http://dx.doi.org/10.1002/mrc.1260300714.

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Shashkov, Alexander S., Dmitry E. Tsvetkov, Alexey A. Grachev, et al. "Structural Analysis of Antibiotic INA 9301 from Amycolatopsis Orientalis." Natural Product Communications 3, no. 10 (2008): 1934578X0800301. http://dx.doi.org/10.1177/1934578x0800301010.

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The dalbaheptide antibiotic INA 9301 was isolated from a culture of Amycolatopsis orientalis. By using a combination of mass spectrometry and NMR spectroscopy, INA 9301 was assessed as N,N-dimethylvancomycin. Detailed 13C NMR characteristics of INA9301 in D2O and DMSO- d 6 are presented, together with 2D 1H-1H ROESY and 1H-13C gHMBC data, which confirmed the configurations of the asymmetric centers and spatial conformational shape of the molecule in aqueous solution.
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Zhou, Qifan, Fangyu Du, Yajie Shi, Ting Fang, and Guoliang Chen. "Synthesis and Analysis of 1-Methyl-4-Phenyl-1H-Imidazol-2-Amine." Journal of Chemical Research 42, no. 12 (2018): 608–10. http://dx.doi.org/10.3184/174751918x15414286606248.

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A practical synthetic route to an important pharmaceutical intermediate 1-methyl-4-phenyl-1H-imidazol-2-amine, via a three-step sequence involving cyclisation, hydrolysis and methylation, is reported. In the process of optimisation, a novel chemical entity was isolated and confirmed to be 2,6-diphenyl-1H-imidazo[1,2-a]imidazole by MS, 1H NMR and 13C NMR. The scale-up experiment was carried out to provide 1-methyl-4-phenyl-1H-imidazol-2-amine in 27.4% total yield.
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SILWOOD, C., M. GROOTVELD, E. LYNCH, and B. MILLS. "Two-dimensional 1H-1H and 1H-13C NMR Analysis of Human Saliva." Biochemical Society Transactions 28, no. 1 (2000): A45. http://dx.doi.org/10.1042/bst028a045b.

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Yaoita, Yasunori, and Koichi Machida. "Conformational Assignments of Thujopsene and Related Compounds." Natural Product Communications 14, no. 9 (2019): 1934578X1987893. http://dx.doi.org/10.1177/1934578x19878936.

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Conformational analysis suggests that thujopsene (1) can exist as 2 possible conformations, steroidal and nonsteroidal. The conformation of 1 has been investigated using a NMR spectroscopic method. Analyses of the 1H NMR, ROESY, and long-range 1H-1H COSY spectra indicate that 1 exists in a steroidal conformation. Although the conformations of related compounds 2 and 3 were originally assigned as nonsteroidal, careful reexamination of the published NMR data indicates that both compounds exist in a steroidal conformation.
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Spiteller, Peter, Jovan Jovanovic, and Michael Spiteller. "NMR analysis of (1S, 1aR, 6aR)-2’, 3’, 6, 6a-tetrahydrospiro cycloprop a indene-1(1aH), 1’- 1H indene." Journal of the Serbian Chemical Society 70, no. 10 (2005): 1133–36. http://dx.doi.org/10.2298/jsc0510133s.

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The aldol condensation product of 1H-indan-1-one, (2E)-2-(2,3-dihydro-1H-in den-1-ylidene)-2,3-dihydro-1H-inden-1-one, subjected to Huang?Minlon reduction conditions was shown, via 1D and 2D NMR analysis, to be a mixture of (1S,1aR,6aR)-2?,3?,6,6a-tetrahydro-spiro cycloprop a indene-1(1aH),1? 1H indene and its 1R,1aS,6aS enantiomer and not 2,3,1?,3?-tetrahydro- 1,2? -biindenylidene as originally expected. The full NMR assignment, the coupling constants in the proton NMR, and the couplings in the HMBC and NOESY of the title compound are summarized in the Table.
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Dissertations / Theses on the topic "1H NMR- analysis"

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Amigó, Grau Núria. "Lipoprotein analysis by 2d diffusion-ordered 1h-nmr spectroscopy." Doctoral thesis, Universitat Rovira i Virgili, 2017. http://hdl.handle.net/10803/665148.

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The need for predictors of cardiovascular disease is increasing due to the pandemic levels that metabolic disorders are achieving. One of the main areas where new biomarkers can be looked for is in the lipids and lipoproteins field. NMR spectroscopy appears to be a suitable analytical tool to develop novel methodologies, which will aid in the assessment and management of cardiovascular events and cardio-metabolic disease, due to its sensitivity to the lipoprotein content and size, robustness and the possibility of automation. Part of the research presented in this thesis is focused on the dev
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Fuertes, Martín Rocio. "1H-NMR glycoprotein analysis: An Advanced approach for inflammatory diseases diagnosis." Doctoral thesis, Universitat Rovira i Virgili, 2019. http://hdl.handle.net/10803/668266.

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La inflamació és una resposta biològica complexa d'un organisme davant d'estímuls de diversa etiologia. Durant la resposta inflamatòria es produeix una variació en les concentracions de certes proteïnes presents en plasma anomenades “proteïnes de fase aguda”. La majoria d'aquestes proteïnes són proteïnes glicadas. El procés de glicosilació de proteïnes augmenta en resposta a citocines proinflamatòries i es caracteritza per la unió d'un o diversos monosacàrids (com són GlcNAc, GalNAC i Neu5Ac, entre d'altres) a la cadena d'aminoàcids de la proteïna. Actualment hi ha un interès creixent en el de
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Davis, Richard. "Analysis of pattern recognition techniques applied to 1H NMR metabolomic data." Thesis, University of York, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.490269.

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Metabolomics seeks to achieve a comprehensive quantitative analysis of the wide range of metabolites in biological samples. Analytical chemistry, and specifically 1H NMR, can provide spectra detailing the vast array of physio-chemical properties of the sample. The identification of characteristics in the spectra is known as metabolomic fingerprinting. However, the thousands of variables in the 1H NMR spectra, .relating to hundreds of metabolites, make the data sets extremely complex and difficult to interpret. The aim of this research was to develop analytical techniques to classify biological
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Lehnström, Angelica. "Using 19F-NMR and 1H-NMR for Analysis of Glucocorticosteroids in Creams and Ointments : -Method Development for Screening, Quantification and Discrimination." Thesis, KTH, Skolan för kemivetenskap (CHE), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-40843.

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Topical treatment containing undeclared corticosteroids and illegal topical treatment with corticosteroid content have been seen on the Swedish market. In creams and ointments corticosteroids in the category of glucocorticosteroids are used to reduce inflammatory reactions and itchiness in the skin. If the inflammation is due to bacterial infection or fungus, complementary treatment is necessary. Side effects of corticosteroids are skin reactions and if used in excess suppression of the adrenal gland function. Therefore the Swedish Medical Products Agency has published related warnings to make
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O'Kennedy, Sean James. "A kinetic and thermodynamic study of procyanidin oligomer conformation by 1H NMR and DFT." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/98054.

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Reynolds, Mark (Mark V. ). Carleton University Dissertation Chemistry. "Conformational analysis of some model crown ethers and analogues via 1H and 13C NMR spectroscopy and X-ray crystallography." Ottawa, 1994.

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Damjanovic, Marko. "13C NMR of a single molecule magnet: analysis of pseudocontact shifts and residual dipolar couplings." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amslaurea.unibo.it/5633/.

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Paramagnetic triple decker complexes of lanthanides are promising Single Molecule Magnets (SMMs), with many potential uses. Some of them show preferable relaxation behavior, which enables the recording of well resolved NMR spectra. These axially symmetric complexes are also strongly magnetically anisotropic, and this property can be described with the axial component of the magnetic susceptibility tensor, χa. For triple decker complexes with phthalocyanine based ligands, the Fermi˗contact contribution is small. Hence, together with the axial symmetry, the experimental chemical shifts in 1H and
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Gómez, Álvarez Josep. "Dolphin and whale: development, evaluation and application of novel bioinformatics tools for metabolite profiling in high throughput 1H-NMR analysis." Doctoral thesis, Universitat Rovira i Virgili, 2016. http://hdl.handle.net/10803/399578.

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El perfilat de metabòlits es la tasca més difícil dins l'anàlisi espectral de RMN. El seu objectiu es comprendre els processos biològics que tenen lloc en un moment concret mitjançant la identificació i quantificació dels metabòlits presents en mescles d' RMN complexes. Un espectre de RMN està compost per ressonàncies d'un gran nombre de metabòlits, i aquestes se solen solapar entre elles, canviar de posició depenent del pH de la mostra i poden quedar emmascarades per senyals de macromolècules. Tots aquests problemes compliquen la identificació i quantificació de metabòlits, pel que obtenir un
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Koch, Katharina [Verfasser], Jaroslaw [Gutachter] Maciaczyk, and Dieter [Gutachter] Willbold. "Analysis of metabolic reprogramming during the enrichment of glioblastoma stem-like cells in glioblastoma via high resolution proton nuclear magnetic resonance (HR 1H-NMR) spectroscopy / Katharina Koch ; Gutachter: Jaroslaw Maciaczyk, Dieter Willbold." Düsseldorf : Universitäts- und Landesbibliothek der Heinrich-Heine-Universität Düsseldorf, 2020. http://d-nb.info/1223705242/34.

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Nam, Anne-Marie. "Contribution de la RMN 13C à l’analyse des huiles végétales, huiles essentielles et résines (Olea europaea, Pinus halepensis et Cedrus atlantica)." Thesis, Corte, 2014. http://www.theses.fr/2014CORT0001/document.

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Les produits issus de la biomasse végétale connaissent depuis quelques années un succès grandissant dans de nombreuses industries (aromathérapie, cosmétique, parfums, etc.). L’objectif de notre étude était, d’une part de contribuer au développement des méthodes d’identification et de quantification des constituants des mélanges naturels par RMN 13C et RMN 1H (par exemple le squalène dans l’huile d’olive), et d’autre part, de contribuer à la caractérisation chimique de deux conifères introduits en Corse, le pin d’Alep (huile essentielle) et le cèdre de l’Atlas (huile essentielle, huile pyrolyti
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Books on the topic "1H NMR- analysis"

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Development and Application of 1H NMR Methodology to Lipoprotein Analysis (Report Series in Physical Sciences, Report No. 13). University of Oulu, 1998.

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Book chapters on the topic "1H NMR- analysis"

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Goad, L. John, and Toshihiro Akihisa. "1H NMR spectroscopy of sterols." In Analysis of Sterols. Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-009-1447-6_8.

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Nagana Gowda, G. A., and Daniel Raftery. "Analysis of Plasma, Serum, and Whole Blood Metabolites Using 1H NMR Spectroscopy." In NMR-Based Metabolomics. Springer New York, 2019. http://dx.doi.org/10.1007/978-1-4939-9690-2_2.

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Nagana Gowda, G. A., and Daniel Raftery. "Analysis of Coenzymes and Antioxidants in Tissue and Blood Using 1D 1H NMR Spectroscopy." In NMR-Based Metabolomics. Springer New York, 2019. http://dx.doi.org/10.1007/978-1-4939-9690-2_6.

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Merkx, Donny, Vincent Boerkamp, John van Duynhoven, and Marie Hennebelle. "Quantitative 1H NMR Analysis of Food Lipid Hydroperoxides and Aldehydes." In Multidimensional Characterization of Dietary Lipids. Springer US, 2024. http://dx.doi.org/10.1007/978-1-0716-3758-6_16.

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Duarte, Tiago M., Nuno Carinhas, Ana Carina Silva, Paula M. Alves, and Ana P. Teixeira. "1H-NMR Protocol for Exometabolome Analysis of Cultured Mammalian Cells." In Animal Cell Biotechnology. Humana Press, 2013. http://dx.doi.org/10.1007/978-1-62703-733-4_16.

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Schripsema, Jan. "Analysis of Butter and Margarine by High-resolution 1H NMR." In Magnetic Resonance in Food Science. Royal Society of Chemistry, 2009. http://dx.doi.org/10.1039/9781847559494-00177.

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Ismail, Ismail M., and Ian D. Wilson. "Detection, Identification and Quantitative Analysis of Drugs by 1H NMR." In BIOACTIVE ANALYTES, Including CNS Drugs, Peptides, and Enantiomers. Springer US, 1986. http://dx.doi.org/10.1007/978-1-4757-1892-8_23.

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Griffin, Julian L., and Elizabeth Sang. "Can 1H NMR Derived Metabolic Profiles Contribute to Proteomic Analyses?" In Metabolic Profiling: Its Role in Biomarker Discovery and Gene Function Analysis. Springer US, 2003. http://dx.doi.org/10.1007/978-1-4615-0333-0_3.

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Seo, Sumin, Sang Beom Han, Karthick Babu Sai Sankar Gupta, and Young Hae Choi. "Optimizing Extraction Solvents for Plant Chemical Analysis Using 1H NMR and Principal Component Analysis." In Methods in Molecular Biology. Springer US, 2025. https://doi.org/10.1007/978-1-0716-4350-1_2.

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Chan, Weng C., Barrie W. Bycroft, Mark L. Leyland, Lu-Yun Lian, and Gordon C. K. Roberts. "Sequence-specific resonance assignment and conformational analysis of subtilin by 1H 2D NMR spectroscopy." In Peptides. Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2264-1_109.

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Conference papers on the topic "1H NMR- analysis"

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Bortolotti, Villiam, Paolo Macini, Ezio Nicola Mesini, Paola Fantazzini, Mirko Gombia, and Falan Srisuriyachai. "Probing Wettability Reversal in Carbonatic Rocks by Spatially Resolved and Non-Resolved 1H-NMR Relaxation Analysis." In SPE Annual Technical Conference and Exhibition. Society of Petroleum Engineers, 2010. http://dx.doi.org/10.2118/133937-ms.

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HIRANKUMAR, G., S. SELVASEKARAPANDIAN, J. KAWAMURA, N. KUWATA, O. KAMISHIMA, and T. HATTORI. "1H NMR AND RAMAN ANALYSIS OF PROTON CONDUCTING POLYMER ELECTROLYTES BASED ON PARTIALLY HYDROLYZED POLY (VINYL ALCOHOL)." In Proceedings of the 10th Asian Conference. WORLD SCIENTIFIC, 2006. http://dx.doi.org/10.1142/9789812773104_0071.

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Kosanović, Marta, Thomas Eichhorn, Dejan Milenković, Goran Kaluđerović, Jasmina Dimitrić Marković, and Dušan Dimić. "Synthesis, spectroscopic, and quantum-chemical analysis of mononuclear Ru(II)-naphthylhydrazine complex." In 2nd International Conference on Chemo and Bioinformatics. Institute for Information Technologies, University of Kragujevac, 2023. http://dx.doi.org/10.46793/iccbi23.391k.

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Ruthenium(II) complexes have become increasingly recognized and utilized as potent anticancer agents in recent years. These compounds possess unique capabilities in targeting cancer cells and interfering with vital cellular processes, offering new hope in the relentless battle against cancer. This research study focuses on the characterization of a newly synthesized Ru(II)-naphthylhydrazine complex by IR and NMR spectroscopies. NMR spectral data have revealed the presence of different chemical environments within 1 based on the chemical shifts observed in the 1H and 13C NMR spectra. The infrar
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Atanasković, Ana, Thomas Eichhorn, Dejan Milenković, Dušan Dimić, Goran Kaluđerović, and Jasmina Dimitrić Marković. "Synthesis, spectroscopic, and theoretical analysis of Ru(II)-phenylhydrazine complex." In 2nd International Conference on Chemo and Bioinformatics. Institute for Information Technologies, University of Kragujevac, 2023. http://dx.doi.org/10.46793/iccbi23.395a.

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In recent decades, metal-based chemotherapeutics have attracted considerable attention and excitement within the oncology research community, with ruthenium(II) complexes emerging as a particularly promising class of anticancer agents. In this study, the synthesis of a new ruthenium complex was performed, followed by its structural characterization using NMR and IC spectroscopy. The compound’s infrared spectrum reveals characteristic bands corresponding to N-H and C-H stretching vibrations from sp2 and sp3 hybridized carbon atoms, vibrations of aromatic rings and additional vibrations related
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Bortolotti, Villiam, Paolo Macini, Ezio Nicola Mesini, Falan Srisuriyachai, Paola Fantazzini, and Mirko Gombia. "Combined spatially resolved and non-resolved 1H-NMR relaxation analysis to assess and monitor wettability reversal in carbonate rocks." In International Petroleum Technology Conference. International Petroleum Technology Conference, 2009. http://dx.doi.org/10.2523/iptc-13443-ms.

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Bortolotti, V., P. Macini, E. Mesini, F. Srisuriyachai, P. Fantazzini, and M. Gombia. "Combined Spatially Resolved and Non-resolved 1H-NMR Relaxation Analysis to Assess and Monitor Wettability Reversal in Carbonate Rocks." In IPTC 2009: International Petroleum Technology Conference. European Association of Geoscientists & Engineers, 2009. http://dx.doi.org/10.3997/2214-4609-pdb.151.iptc13443.

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Sagar, James, Kate Kemsley, Marcel Lachenmann, Rachel Brignall, and Yvonne Brignall. "High throughput authenticity screening of high value edible oils with benchtop NMR." In 2022 AOCS Annual Meeting & Expo. American Oil Chemists' Society (AOCS), 2022. http://dx.doi.org/10.21748/nqle8204.

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The high value of edible oils such as olive and argan makes them economically attractive targets for adulteration. Argan oil is becoming increasingly widely used in areas from cooking to cosmetics due to its reported pharmacological effects. Because argan oil is recognised as a Protected Geographical Indication product of its native Morocco, supply is limited. These two factors have led to argan oil becoming one of the most expensive edible oils in the world, leading to increasing numbers of cases of adulteration.As a typical nut oil, argan oil is composed predominantly of triglycerides. In pr
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B.R, Athul, Venkatesh R, and Vadivelan G. "Synthesis and Characterization Studies of Benzimidazol-3-Ium Furan-2-Carboxylate Crystal." In The Second National Conference on Emerging Materials for Sustainable Future. Asian Research Association, 2024. http://dx.doi.org/10.54392/ara24111.

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A new charge transfer (CT) complex, Benzimidazol-3-ium furan-2-carboxylate (2FBI) was prepared and a method employed to purify solid compounds low temperature solution growth technique at comfortable temperature. The charge transfer compound was depicted using CHN analysis, Ultraviolet visible spectra, IR spectra, 1H NMR spectra, and thermal behavior. Thermogravimetric (TG) and differential thermal analysis are used to study its biological activities, including its antibacterial activity, which showed significant capacity against S. aureus and E. coli.
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Rilak Simović, Ana, Milica Međedović, Dejan Lazić, Milan Vraneš, Ghodrat Mahmoudi, and Biljana Petrović. "Biological activity of thienyl-terpyridine Ru(II) complex in the presence of biocompatible ionic liquids." In 2nd International Conference on Chemo and Bioinformatics. Institute for Information Technologies, University of Kragujevac, 2023. http://dx.doi.org/10.46793/iccbi23.519rs.

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New mononuclear Ru(II)-thienyl-terpyridine complex [Ru(thienyl-tpy)(bpy)Cl]Cl (where thienyl-tpy = 4’-(2-thienyl)-2,2’:6’,2’’-terpyridine, bpy = 2,2’-bipyridine) has been synthesized and then characterized through elemental analysis, followed by various spectroscopic (IR, UV−vis, 1H and 13C NMR) and mass spectrometric technique (ESI Q-TOF MS). Furthermore, the interactions with CT DNA were performed both in the absence and presence of biocompatible ionic liquids 1-amino-2-propanol-lactate (IL1), 1-amino-2-propanol-oxalate (IL2) and 1-amino-2-propanol-citrate (IL3).
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Chatzis, L., I. Barla, S. Kaltsi, et al. "POS0999 METABOLOMIC PROFILING OF SALIVA IN PRIMARY SJÖGREN’S SYNDROME PATIENTS: A COMPREHENSIVE ANALYSIS USING HIGH-RESOLUTION 1H 1D NMR SPECTROSCOPY AND MASS SPECTROMETRY." In EULAR 2024 European Congress of Rheumatology, 12-15 June. Vienna, Austria. BMJ Publishing Group Ltd and European League Against Rheumatism, 2024. http://dx.doi.org/10.1136/annrheumdis-2024-eular.3477.

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Reports on the topic "1H NMR- analysis"

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Joel, Daniel M., John C. Steffens, and Alfred M. Mayer. Host-Elicited Germination and Mechanism of Penetration in Broomrape (Orobanche Spp.). United States Department of Agriculture, 1993. http://dx.doi.org/10.32747/1993.7568107.bard.

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Orobanche is an important parasitic weed. For developing novel methods for its control, a thorough understanding of crucial stages of its development is needed. Therefore, the objectives of this project were characterization of Orobanche germination stimulants, analysis of mechanisms of haustorial penetration, and characterization and isolation of penetration enzymes. The first highly potent natural germination stimulant for Orobanche was isolated from sunflower and identified by high-field 1D (1H and 13C), 2D (1H-1H COSY, HMQC, HMBC)-NMR, GC.FT-IR, and GC.MS as costuslactone, a guaiane type s
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