A new steroidal saponin from Polygonatum sibiricum.

A new furostan type steroidal saponin, kingianoside Z (1), along with four known compounds (2-5), was isolated from the ethanolic extract of Polygonatum sibiricum Delar. ex Redoute. Their structures were determined by spectroscopical method and by comparison with previously reported spectroscopic data. Compounds 3-5 showed significant cytotoxicity against HepG2 cell lines with IC50 values of 14.2, 12.1 and 8.5 µM, respectively.