New triterpenoid saponins from Maesa tenera

Abstract

Two new triterpenoid saponins, maetenosides A and B were isolated from the aerial parts of Maesa tenera and were respectively defined as 3-O-[β-D-glucopyranosyl-(1→2)-α-L-rhamnopyranosyl- (1→2)-β-D-galactopyranosyl-(1→3)][β-D-glucopyranosyl- (1→2)]-β-D-glucuronopyranosyl camelliagenin A 22-O-angelate (1) and 3-O-[α-L-rhamnopyranosyl-(1→2)-β-D-galactopyranosyl- (1→3)] [β-D-glucopyranosyl-(1→2)]-β-D-glucuronopyranosyl camelliagenin A 22-O-angelate (2). Their structures were established on the basis of chemical and spectroscopic methods.