Cynanotophyllosides E-F, two minor pregnane glycosides from the roots of cultivatedCynanchum otophyllum

AbstractCynanotophyllosides E-F, two new minor pregnane glycosides were isolated from the antidepressant active fraction of cultivated Cynanchum otophyllum, and their structures were determined as 12-O-vanilloyl-deacetylmetaplexigenin 3-O-β-D-glucopyranosyl-(1→4)-β-D-glucopyranosyl-(1→4)-β-D-cymaropyranosyl-(1→4)-β-D-oleandropyranosyl-(1→4)-β-D-digitoxopyranoside, and 12-O-nicotinoyl-deacetylmetaplexigenin 3-O-β-D-glucopyranosyl-(1→4)-β-D-glucopyranosyl-(1→4)-β-D-cymaropyranosyl-(1→4)-β-D-oleandropyranosyl-(1→4)-β-D-cymaropyranoside respectively, with the combination of spectroscopic and chemical analysis.Keywords: AsclepiadaceaeCynanchum otophyllumpregnane glycosidescynanotophyllosides E-F AcknowledgmentsThe authors are grateful to Professor Chong-Ren Yang (Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China) for supplying the 2-deoxysugar samples and Prof. Li-Chun Yuan (the Institute of Alpine Economic Plant in Yunnan Academy of Agricultural Sciences, Lijiang, China) for supplying and identifying the plant material.Disclosure statementThe authors report no conflicts of interest.Additional informationFundingThis research work was financially supported by the NSFC (31760091, 31160076), CAS Key Laboratory of Mental Health, Institute of Psychology (KLMH2016G01) and Special Foundation for Traditional Chinese Medicine Modernization of Guizhou Province ([2008] No. 5022).