Journal
HELVETICA CHIMICA ACTA
Volume 97, Issue 11, Pages 1546-1554Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/hlca.201400051
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Funding
- NSFC [81373288]
- Natural Science Foundation of Yunnan Province [2008CD158]
- Western Doctoral Foundation of Chinese Academy of Sciences
- Foundation of State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences [P2008ZZ23, P2010ZZ14]
- Cooperative Project of Guangdong Province
- CAS [2009B091300135]
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Four new 5 beta,19-epoxycucurbitacins, kuguacins T-W (1-4, resp.), along with nine known cucurbitane derivatives, 5-13, were obtained from the fresh fruit of Momordica chrantia. Structures of the new metabolites were elucidated as 5 beta,19-epoxy-25-hydroxycucurbitane-3,7,23-trione (1), 5 beta,19-epoxy-3,7-dioxo-23,24,25,26,27-pentanorcucurbitan-22-oic acid (2), 5 beta,19-epoxy-3 beta-hydroxycucurbit-24-ene-7,23-dione (3), and 5 beta, 19-epoxy-25-hydroxycucurbit-23-ene-3,7-dione (4), by extensive spectroscopic investigations, which were confirmed by a single-crystal X-ray diffraction analyses in the case of compound 4.
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