Abstract
Three novel triterpene saponins named desacylmasonosides 1 (1), 2 (2), and 3 (3) have been isolated from the weak alkaline hydrolyzate of the crude saponin obtained from the corms of Crocosmia masonorum. On the basis of spectral and chemical evidence, their structures were characterized as 3-O-[α-L-arabinopyranosyl-(1→6)-β-D-glucopyranosyl]-28-O-{2-O-[β-D-apio-D-furanosyl-(1→4)-β-D-xylopyranosyl-(1→4)-α-L-rhamnopyranosyl]-3-O-(β-D-glucopyranosyl)-β-D-fucopyranosyl}polygalacic acid (1), 3-O-β-D-glucopyranosyl-28-O-{2-O-[β-D-apio-D-furanosyl-(1→4)-β-D-xylopyranosyl-(1→4)-α-L-rhamnopyranosyl]-3-O-(β-D-glucopyranosyl)-β-D-fucopyranosyl}polygalacic acid (2) and 3-O-[α-L-arabinopyranosyl-(1→6)-β-D-glucopyranosyl]-28-O-{2-O-[β-D-xylopyranosyl-(1→4)-α-L-rhamnopyranosyl]-3-O-(β-D-glucopyranosyl)-β-D-fucopyranosyl}polygalacic acid (3).
