Monoterpenoid glycosides from Ligustrum robustum

Eight new monoterpenoid glycosides named ligurobustosides A, B, C, E, F, I, J and K were isolated from the leaves of Ligustrum robustum. Their structures were established as geraniol (3'-O-x-L-rhamnopyranosyl-β-D- glucopyranoside), geraniol (3'-O-α-L-rhamnopyranosyl-4'-caffeoyl-β-D- glucopyranoside), geraniol (3'-O-α-L-rhamnopyranosyl-4'-p-coumaroyl-β-r)- glucopyranoside), geraniol (3'-O-α-L-rhamnopyranosyl-6'-O-p-coumaroyl-β-D- glucopyranoside), 6-hydroxy-3,7-dimethyl-2E,7-octadienyl-(3'-O-α-L- rhamnopyranosyl-6'-O-p-coumaroyl-β-D-glucopyranoside), 7-hydroxy-3,7- dimethyl-2E, 5E-octadienyl-(3'-O-α-L-rhamnopyranosyl-4'-O-p-coumaroyl)-β- D-glucopyranoside), geraniol-[(3_-O-α-L-rhamnopyranosyl-(1 → 4)-α-L- rhamnopyranosyl)-(4'-O-p-coumaroyl-β-D-glucopyranoside], 6,7-dihydroxy-3,7- dimethyl-2E-octadienyl-(3'-O-α-L-rhamnopyranosyl-4'-O-p-coumaroyl-β-D- glucopyranoside) respectively, by spectroscopic and chemical methods.