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C21 steroidal glycosides from Cynanchum wallichii Wight
Gang Chen1, Nan Xu, Yue-Hu Pei
1School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, China.
Abstract:
Three new C21 steroidal glycosides, characterized with rostratamine and qinyangshengenin as aglycone moiety and 2,6-dideoxy-pyranoses as component sugars, have been isolated from the roots of Cynanchum wallichii Wight. The structures of the three new C21 steroidal glycosides were elucidated as rostratamine-3-O-beta-D-oleandropyranosyl-(1 --> 4)-beta-d-cymaropyranosyl-(1 --> 4)-beta-D-cymaropyranoside, qinyangshengenin-3-O-beta-D-cymaropyranosyl-(1 --> 4)-beta-D-digitoxo-pyranoside, and qinyangshengenin-3-O-beta-D-oleandropyranosyl-(1 --> 4)-beta-D-cymaropyranosyl-(1 --> 4)-beta-D-digitoxopyranoside.
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