Two new xanthone glycosides,tetraswerosides A and B,were isolated from the whole plant of Swertia tetraptera.Their structures were determined as 3-O-b-D-glucopy
Gnetupendin C, a new dimer coupled by a resveratrol and an oxyresveratrol unit, was isolated from the lianas of Gnetum pendulum C.Y. Cheng (Gnetaceae). Its stru
In this paper, the fluorescence spectra of model compounds of light-emitting alternating copolymers, M (TPA-PPV) and M (TPA-PAV) (Scheme 1) were studied and the