Structure of mimengosides A and B, new triterpenoid glycosides from Buddlejae flos produced in China

Two new triterpenoid glycosides, named mimengosides A (1) and B (2), along with acteoside (3) were isolated from the Buddlejae Flos (flower and bud of Buddleja officinalis). The structures of 1 and 2 were determined as 3-O-α-L-rhamnopyranosyl-(1→4)-β-D-glucopyranosyl-(1→3)-[β-D-glucopyranosyl-(1→2)-β-D-fucopyranoside of 16-dehydroxysaikogenin G and that of 3, 23, 28-trihydroxy-11-methoxy-olean-12-ene, respectively, by spectral and chemical methods.