Two New C 21 Steroidal Glycosides from the Stems of Cynanchum paniculatum Kitag.

Two new glycosides, (3 β ,8 β ,9 α ,16 α ,17 α )‐14,16 β  : 15,20 α :18,20 β ‐triepoxy‐16 α ,17 α ‐dihydroxy‐14‐oxo‐13,14 : 14,15‐disecopregna‐5,13(18)‐dien‐3‐yl α ‐cymaropyranosyl‐(1→4)‐ α ‐digitoxopyranosyl‐(1→4)‐ α ‐oleandropyranoside ( 1 ) and (3 β ,8 β ,9 α ,16 α ,17 α )‐14,16 β  : 15,20 α  : 18,20 β ‐triepoxy‐16 β  : 17 α ‐dihydroxy‐14‐oxo‐13,14 : 14,15‐disecopregna‐5,13(18)‐dien‐3‐yl α ‐oleandropyranosyl‐(1→4)‐ α ‐digitoxopyranosyl‐(1→4)‐ α ‐oleandropyranoside ( 2 ) were isolated from the stems of Cynanchum paniculatum ( Bunge ) Kitag . The structures of the new compounds were elucidated by means of spectral data, including HR‐ESI‐MS, and 1D‐, and 2D‐NMR.