Phytochemical constituents of Onosma bracteatum Wall.

Phytochemical investigation of Onosma bracteatum Wall. revealed three new compounds (1-3) as well as thirty-four known compounds (4-37). Their structures were determined by means of extensive spectroscopic analysis including UV, IR, HRESIMS, 1H NMR, 13C NMR, COSY, HSQC and HMBC. All of these compounds were isolated from this plant for the first...