Academic literature on the topic 'Sesquiterpenes - Structure'

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Journal articles on the topic "Sesquiterpenes - Structure"

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Farooq, Umar, Afsar Khan, Saleha Suleman Khan, et al. "Isolation and Structure Determination of Three New Sesquiterpenoids from Achillea millefolium." Zeitschrift für Naturforschung B 67, no. 5 (2012): 421–25. http://dx.doi.org/10.5560/znb.2011-0244.

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Phytochemical investigation of the whole plant of Achillea millefolium led to the isolation of three new sesquiterpenes which were trivially named as sesquiterpene lactone-esters A and B (1 and 2), and sesquiterpene lactone-diol (3). The structures of these compounds were determined with the help of one- and two-dimensional (1D and 2D) NMR techniques including 1H NMR, 13C NMR, HMQC, HMBC, COSY, and NOESY experiments.
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Ayer, William A., Peter A. Craw, Thomas J. Stout, and Jon Clardy. "Novel sesquiterpenoids from the fairy ring fungus, Marasmiusoreades." Canadian Journal of Chemistry 67, no. 5 (1989): 773–78. http://dx.doi.org/10.1139/v89-116.

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The structures of four new drimane-type sesquiterpenes 1–4 produced in liquid cultures of the fairy ring fungus, Marasmiusoreades, have been determined by a combination of chemical and spectroscopic methods. The structure assigned to one of these sesquiterpenes (1) has been confirmed by an X-ray crystallographic study. An unprecedented feature of all four sesquiterpenes is the biosynthetic elaboration of C8–C12 and C15 of the drimane skeleton to a dioxabicyclooctane moiety. In addition, two of the sesquiterpenes possess an uncommon α orientation of the hydroxyl groups at C3. Keywords: sesquite
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Sánchez-Martínez, Raquel, Lucinda Villaescusa-Castillo, Manuel Bernabé, and Ana María Díaz-Lanza. "Two New Eudesmane Alcohols from Jasonia glutinosa." Zeitschrift für Naturforschung C 55, no. 9-10 (2000): 693–96. http://dx.doi.org/10.1515/znc-2000-9-1004.

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Abstract Two new sesquiterpene alcohols have been isolated from the aerial parts of Jasonia glutinosa D. C. The structure of these sesquiterpenes were characterized by 1D and 2D NMR techniques (DQCOSY, TOCSY, NOESY, HMQC and HMBC) as (11R)-eudesm -4-en-11,12- diol and (11R)-eudesmane-5α,11,12-triol.
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Liang, Dongmei, Weiguo Li, Xiaoguang Yan, Qinggele Caiyin, Guangrong Zhao, and Jianjun Qiao. "Molecular and Functional Evolution of the Spermatophyte Sesquiterpene Synthases." International Journal of Molecular Sciences 22, no. 12 (2021): 6348. http://dx.doi.org/10.3390/ijms22126348.

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Sesquiterpenes are important defense and signal molecules for plants to adapt to the environment, cope with stress, and communicate with the outside world, and their evolutionary history is closely related to physiological functions. In this study, the information of plant sesquiterpene synthases (STSs) with identified functions were collected and sorted to form a dataset containing about 500 members. The phylogeny of spermatophyte functional STSs was constructed based on the structural comparative analysis to reveal the sequence–structure–function relationships. We propose the evolutionary hi
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Könen, Philipp P., Ines Stötzel, Wilfried Schwab, and Matthias Wüst. "Qualitative profiling of mono- and sesquiterpenols in aglycon libraries from Vitis vinifera L. Gewürztraminer using multidimensional gas chromatography–mass spectrometry." European Food Research and Technology 247, no. 5 (2021): 1117–24. http://dx.doi.org/10.1007/s00217-021-03692-3.

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AbstractIn grape berries (Vitis vinifera L.), sesquiterpenes are mainly accumulated as hydrocarbons in the epicuticular wax layer of grapes, whereas monoterpenes, which are predominantly present as alcohols, are glycosylated and are stored as glycosides in the vacuoles of grape berry cells. In this study, extensive analysis of grape berry hydrolysates by means of comprehensive two-dimensional gas chromatography–time-of-flight–mass spectrometry demonstrated that glycosylated sesquiterpene alcohols show very little structural diversity when compared to the sesquiterpene hydrocarbon fraction in t
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Reichling, Jürgen, Ulrike Suschke, Jürgen Schneele, and Heinrich Konrad Geiss. "Antibacterial Activity and Irritation Potential of Selected Essential Oil Components – Structure-Activity Relationship." Natural Product Communications 1, no. 11 (2006): 1934578X0600101. http://dx.doi.org/10.1177/1934578x0600101116.

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A selection of structurally diverse components of essential oils was subjected to an antibacterial screening against the Gram-positive bacteria Staphylococcus aureus and Streptococcus pneumoniae as well as the Gram-negative bacteria Escherichia coli and Haemophilus influenzae using a broth microdilution method. In addition, the irritation potential of these substances to mucous membranes was evaluated by a modified HET-CAM (Hen's Egg Test-Chorioallantoic Membrane) assay. Minimum inhibitory concentrations (MIC) and irritation threshold concentrations (ITC) were compared in order to identify sub
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Choodej, Siwattra, Khanitha Pudhom та Tohru Mitsunaga. "Inhibition of TNF-α-Induced Inflammation by Sesquiterpene Lactones from Saussurea lappa and Semi-Synthetic Analogues". Planta Medica 84, № 05 (2017): 329–35. http://dx.doi.org/10.1055/s-0043-120115.

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We investigated the tumor necrosis factor-alpha (TNF-α) inhibitory activity of sesquiterpenes from Saussurea lappa root extracts. According to the hexane and EtOAc extracts showing significant activity with IC50 values of 0.5 and 1.0 µg/mL, respectively, chromatographic fractionation of the extracts was performed and led to the isolation of 10 sesquiterpenes (1–10). Costunolide (1), a major compound, and dehydrocostus lactone (4) exhibited high efficiency in decreasing TNF-α levels, with IC50 values of 2.05 and 2.06 µM, respectively. In addition, sesquiterpene analogues were synthesized to est
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Coll, JC, BW Skelton, AH White, and AD Wright. "Tropical Marine Algae. V. The Structure Determination of Two Novel Sesquiterpenes From the Red Alga Laurencia tenera (Rhodophyceae, Ceramiales, Rhodomelaceae)." Australian Journal of Chemistry 42, no. 10 (1989): 1695. http://dx.doi.org/10.1071/ch9891695.

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Laurencia tenera has been shown to contain two novel sesquiterpenes. The structure of the less abundant metabolite (3) was determined by single-crystal X-ray diffraction as (1S,2R,4S,5R,6R,8S,9R)-4,8-dibromo-2,5,6,9-tetramethyltricyclo[7.2.0.01.6] undecane-3-one.‡ The more abundant, but less stable metabolite (4) was investigated by extensive high-field N.M.R. spectroscopy. Its structure is proposed as (1S*,2R*,4R*,5R*,6R*,8R*)-4-bromo-2,5,6-trimethyl-11-methylenetricyclo[6.2.1.01.6]undecan-3-one.§ The sesquiterpene (3) is isomeric with the known metabolite perforatone (5).
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Novak, Igor, Branka Kovač, and Goran Kovačević. "Structure and stability of common sesquiterpenes." Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 58, no. 10 (2002): 2223–26. http://dx.doi.org/10.1016/s1386-1425(01)00730-2.

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Hamed, Ashraf Nageeb El-Sayed, Wim Wätjen, Roland Schmitz, et al. "A New Bioactive Sesquiterpenoid Quinone from the Mediterranean Sea Marine Sponge Dysidea avara." Natural Product Communications 8, no. 3 (2013): 1934578X1300800. http://dx.doi.org/10.1177/1934578x1300800303.

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Investigation of the marine sponge Dysidea avara, family Dysideidae, afforded a new sesquiterpene (-)- N-methylmelemeleone-A (5), in addition to four known sesquiterpenes (+)-avarol (1), (+)-avarone (2), (-)-3′-methylaminoavarone (3) and (-)-4′-methylaminoavarone (4). The structure elucidation of compound 5 was based on 1D and 2D NMR spectroscopic, and HR-MS studies, as well as by comparison with the literature. Cytotoxicity, protein kinase inhibition, inhibition of NFkB-activity and insecticidal activity were evaluated for the isolated compounds.
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Dissertations / Theses on the topic "Sesquiterpenes - Structure"

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Greenhagen, Bryan T. "Origins of isoprenoid diversity a study of structure-function relationships in sesquiterpene systems /." Lexington, Ky. : [University of Kentucky Libraries], 2003. http://lib.uky.edu/ETD/ukyplph2003d00093/Greenhagen.pdf.

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Thesis (Ph. D.)--University of Kentucky, 2003.<br>Title from document title page (viewed onJune 1, 2004). Document formatted into pages; contains x, 145 p. : ill. Includes abstract and vita. Includes bibliographical references (p. 126-143).
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Sy, Lai-king. "Structure elucidation and oxidation chemistry of natural products /." Hong Kong : University of Hong Kong, 1998. http://sunzi.lib.hku.hk/hkuto/record.jsp?B19737300.

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施麗琼 and Lai-king Sy. "Structure elucidation and oxidation chemistry of natural products." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1998. http://hub.hku.hk/bib/B3123768X.

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Anand, Sridhar. "Structure-toxicity relationship studies of the sesquiterpene lactone repin /." Full text available from ProQuest UM Digital Dissertations, 2008. http://0-proquest.umi.com.umiss.lib.olemiss.edu/pqdweb?index=0&did=1850447711&SrchMode=1&sid=5&Fmt=2&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1279129305&clientId=22256.

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Thesis (Ph.D.)--University of Mississippi, 2008.<br>Typescript. Vita. "May 2008." Major professor: Dr. John M. Rimoldi Includes bibliographical references (leaves 121-143). Also available online via ProQuest to authorized users.
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Pillay, Pamisha. "Structure elucidation of antiplasmodial sesquiterpene lactones from Vernonia staehelinoides and Oncosiphon piluliferum." Pretoria : [s.n.], 2005. http://upetd.up.ac.za/thesis/available/etd-04162007-102438.

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Greenhagen, Bryan T. "ORIGINS OF ISOPRENOID DIVERSITY: A STUDY OF STRUCTURE-FUNCTION RELATIONSHIPS IN SESQUITERPENE SYNTHASES." UKnowledge, 2003. http://uknowledge.uky.edu/gradschool_diss/440.

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Plant sesquiterpene synthases catalyze the conversion of the linear substrate farnesyl diphosphate, FPP, into a remarkable array of secondary metabolites. These secondary metabolites in turn mediate a number of important interactions between plants and their environment, such as plant-plant, plant-insect and plant-pathogen interactions. Given the relative biological importance of sesquiterpenes and their use in numerous practical applications, the current thesis was directed towards developing a better understanding of the mechanisms employed by sesquiterpene synthases in the biosynthesis of s
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Liu, Yixi. "Isolation and Structure Elucidation of Anticancer and Antimalarial Natural Products." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/52259.

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As part of an International Cooperative Biodiversity Group (ICBG) program and a continuing search for antiproliferative natural products from the Madagascar rainforest, and a collaborative research project established between Virginia Tech and the Institute for Hepatitis and Virus Research (IHVR) focusing on searching for bioactive natural products from tropical forests in South Africa, 20 extracts were selected for investigation based on their antiproliferative activities against A2780 human ovarian cancer cell line or antimalarial activities against the Dd2 strain of Plasmodium falciparum. B
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Bagal, Sharanjeet K. "The dimerisation of butenolide structures : a biomimetic approach to the dimeric sesquiterpene lactones (±)-biatractylolide and (±)-biepiasterolide." Thesis, University of Oxford, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.409726.

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Stefani, Ricardo. "Quimitaxonomia e fitoquímica de espécies da tribo Heliantheae (Asteraceae) e uso de Quimioinformática em elucidação estrutural." Universidade de São Paulo, 2002. http://www.teses.usp.br/teses/disponiveis/59/59138/tde-04062009-151139/.

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A química de produtos naturais sempre foi uma fonte importante de novas substâncias e de substâncias bioativas. No mundo moderno, o homem utiliza os produtos naturais para diversos fins: corantes, edulcorantes, essências, defensivos agrícolas e principalmente medicamentos. Com o desenvolvimento das técnicas de isolamento de substâncias, cresceu a necessidade de organizar as informações obtidas e também a criação de meios para a identificação mais rápida das substâncias isoladas. Esta foi uma das necessidades que fez surgir a Quimioinformática. Quimioinformática é uma disciplina que utiliza os
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Vasanthalakshmi, B. "Ireland-Claisen Rearrangement Based Strategy To Sesquiterpenes Containing Vicinal Quaternary Carbon Atoms." Thesis, 2006. http://hdl.handle.net/2005/390.

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Among Nature's creation, terpenoids are more versatile and exciting natural products. In a remarkable display of synthetic ingenuity and creativity, nature has endowed terpenes with a bewildering array of carbocyclic frameworks with unusual assemblage of rings and functionalities. This phenomenal structural diversity of terpenes makes them ideal targets for developing and testing new synthetic strategies for efficient articulation of carbocyclic frameworks. The thesis entitled “Ireland-Claisen Rearrangement Based Strategy to Sesquiterpenes Containing Vicinal Quaternary Carbon Atoms” demonstrat
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Book chapters on the topic "Sesquiterpenes - Structure"

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Pardo-Novoa, Julio C., and Carlos M. Cerda-García-Rojas. "New Techniques of Structure Elucidation for Sesquiterpenes." In Progress in the Chemistry of Organic Natural Products 114. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-59444-2_3.

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Schmidt, Thomas J. "Structure-Activity and Activity-Activity Relationships of Sesquiterpene Lactones." In Sesquiterpene Lactones. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-78274-4_15.

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Vidari, G., and P. Vita-Finzi. "Sesquiterpenes and other secondary metabolites of genus Lactarius (Basidiomycetes): Chemistry and biological activity." In Structure and Chemistry (Part D). Elsevier, 1995. http://dx.doi.org/10.1016/s1572-5995(05)80084-5.

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Capon, Robert John. "Marine sesquiterpene/quinones." In Structure and chemistry (Part C). Elsevier, 1995. http://dx.doi.org/10.1016/s1572-5995(06)80134-1.

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Taber, Douglass F. "Chloranthalactone (Liu), Rumphellaone A (Kuwahara), Lactiflorin (Bach), Echinosporin (Hale), Harveynone (Taylor), (6,7-deoxy)-Yuanhuapin (Wender)." In Organic Synthesis. Oxford University Press, 2015. http://dx.doi.org/10.1093/oso/9780190200794.003.0082.

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The lindenane sesquiterpenes, exemplified by chloranthalactone 4, display interesting physiological activity. Bo Liu of Sichuan University assembled (Organic Lett. 2011, 13, 5406) 4 by opening the epoxide 1 to the carbene, which cyclized to 3. Establishment of the relative configuration of sidechain stereogenic centers is a continuing issue in carbocyclic synthesis. Shigefumi Kuwahara of Tohoku University paired (Tetrahedron Lett. 2012, 53, 705) Sharpless epoxidation, to prepare 5, with the Stork epoxy nitrile cyclization, leading to (+)-rumphellaone A 7. Three competing structures had been put forward for the structure of (+)-lactiflorin 10. Thorsten Bach of the Technische Universität München settled (Angew. Chem. Int. Ed. 2012, 51, 1261) this controversy by preparing the most likely structure, 10, and showing that it was congruent with the natural product. A key step in the synthesis was the tethered 2+2 cycloaddition of 8 to give 9. The conversion of a carbohydrate to a carbocycle is a powerful strategy for the enantiospecific construction of natural products. En route to (–)-echinosporin 14, Karl J. Hale of Queen’s University Belfast added (Org. Lett. 2012, 14, 3024) the allene 12 to the enone 11, prepared from glucose, to give the cyclopentene 13. Richard J.K. Taylor of the University of York prepared (Tetrahedron Lett. 2010, 51, 6619) the enone 16 by oxidation of m-iodophenol 15 followed by asymmetric epoxidation. Reduction followed by deprotection and Pd-mediated coupling delivered (–)-harveynone 17. Some of the daphnane diterpene orthoesters, exemplified by (6,7-deoxy)-yuanhuapin 20, are single-digit nanomolar inhibitors of protein kinase C. Paul A. Wender of Stanford University, in the course of initial studies to optimize this remarkable activity, prepared (Nature Chem. 2011, 3, 615) 20 by way of the thermal cyclization of 18 to 19.
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Schmidt, Thomas J. "Structure-Activity Relationships of Sesquiterpene Lactones." In Studies in Natural Products Chemistry. Elsevier, 2006. http://dx.doi.org/10.1016/s1572-5995(06)80030-x.

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Kubo, Isao. "Antifungal sesquiterpene dialdehydes from the Warburgia plants and their synergists." In Structure and Chemistry (Part D). Elsevier, 1995. http://dx.doi.org/10.1016/s1572-5995(05)80086-9.

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Nay Win Tun, Khun, Nanik Siti Aminah, Alfinda Novi Kristanti, Hnin Thanda Aung, and Yoshiaki Takaya. "Sesquiterpene from Myanmar Medicinal Plant (Curcuma comosa)." In Terpenes and Terpenoids [Working Title]. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.93794.

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Curcuma comosa (Zingiberaceae) is widely grown in tropical and subtropical areas of Asia, like Thailand, Indonesia, Malaysia, and Myanmar. In Myanmar, the rhizome of Curcuma comosa is called Sa-nwin-ga, and local people had used it as a traditional medicine for stomach ache, diabetes mellitus, and hypertension. This species produces secondary metabolites of phenolic and nonphenolic groups. Phenolic groups like diarylheptanoids and flavonoids. While nonphenolics are terpenoids, especially sesqui- and monoterpenes. In this chapter, the group of sesquiterpene compounds from Curcuma comosa starts from the isolation technique, followed by the elucidation of the molecular structure, and their activity tests have been discussed.
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K. Paknikar, Shashikumar, and Kamlesh Pai Fondekar. "Recent Developments in Selected Sesquiterpenes: Molecular Rearrangements, Biosynthesis, and Structural Relationship among Congeners." In Terpenes and Terpenoids. IntechOpen, 2018. http://dx.doi.org/10.5772/intechopen.74998.

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"Structural elucidation of an irregular sesquiterpene alcohol from Peucedanum palustre (L.) moench." In Progress in Essential Oil Research. De Gruyter, 1986. http://dx.doi.org/10.1515/9783110855449-028.

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Conference papers on the topic "Sesquiterpenes - Structure"

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Kuck, K., B. Lipowicz, G. Jürgenliemk, and J. Heilmann. "Isolation and structure elucidation of several tri- and sesquiterpenes from Commiphora myrrha (Nees) Engl." In 67th International Congress and Annual Meeting of the Society for Medicinal Plant and Natural Product Research (GA) in cooperation with the French Society of Pharmacognosy AFERP. © Georg Thieme Verlag KG, 2019. http://dx.doi.org/10.1055/s-0039-3399896.

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Luo, Huajun, Junzhi Wang, Yuan Zhou, and Kun Zou. "Quantitative Structure-Activity Relationship of Sesquiterpene Lactones with Anti-Ulcerogenic Activity." In 2009 3rd International Conference on Bioinformatics and Biomedical Engineering (iCBBE). IEEE, 2009. http://dx.doi.org/10.1109/icbbe.2009.5163275.

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Kimani, Njogu, Josphat Matasyoh, Marcel Kaiser, Mauro Nogueira, Gustavo Trossini, and Thomas Schmidt. "An extended study on quantitative structure-antitrypanosomal activity relationships of sesquiterpene lactones." In 4th International Electronic Conference on Medicinal Chemistry. MDPI, 2018. http://dx.doi.org/10.3390/ecmc-4-05591.

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Scotti, Marcus Tullius, Chonny Herrera-Acevedo, and Luciana Scotti. "A Combined Approach of Ligand-based and Structure-based Virtual Screening to select structures with potential antichagasic activity from SISTEMATX sesquiterpene lactones database." In MOL2NET 2017, International Conference on Multidisciplinary Sciences, 3rd edition. MDPI, 2017. http://dx.doi.org/10.3390/mol2net-03-05060.

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Alves, Geomar Souza, Fábio Luiz Paranhos Costa, Antônio Maia de Jesus Chaves Neto, and Gunar Vingre da Silva Mota. "Análise de RMS de 13C usando GIAO, CSGT e IGAIM: Fatores de escalonamentos de Terpenos." In VIII Simpósio de Estrutura Eletrônica e Dinâmica Molecular. Universidade de Brasília, 2020. http://dx.doi.org/10.21826/viiiseedmol2020153.

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Terpenes are natural products that have several biological and pharmacological properties that are directly related to their chemical structures. In the structural determination of organic molecules, Nuclear Magnetic Resonance (NMR) is used on a large scale. The chemical shift (δ) being the most important parameter. The present study aims to develop and test (the elemol molecule will be used for this purpose) δ scaling factors from 13C to terpenes, based on linear regressions. 10 complex sesquiterpene molecules were selected with the unmistakably determined structures (confirmed with X-ray cry
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