Two New Oleanane Saponins from Chiococca alba (L.) Hitch.

摘要

Two triterpene saponins were isolated from the ethanolic extract of the roots of Chiococca alba (L.) Hitch (Rubiaceae). Their structures were determined by H-1 and C-13 1D and 2D NMR and high resolution electrospray mass spectrometry as 3-O-beta-D-glucopyranurosyl-3 beta-hydroxyolean-12,15- dien-28-oic acid 28-O-alpha-D-apiofuranosyl (1 -> 3)-[alpha-D-apiofuranosyl (1 -> 4)]-alpha-L-rhamnopyranosyl (1 -> 2)-alpha-L-arabinopyranosyl ester (1) and 3-O-beta-D-glucopyranurosyl-3 beta-hydroxyolean- 12,15-dien-28-oic acid 28-O-alpha-D-apiofuranosyl (1 -> 3)-alpha-L-rhamnopyranosyl (1 -> 2)-alpha-L-arabinopyranosyl ester (2).