Stilbenoids from the seeds of Oroxylum indicum

Phytochemical investigation on the seeds of Oroxylum indicum (L.) Vent. led to the isolation of two new stilbenoid compounds (E)-dihydropinosylvin-2-carboxyl-5-O-β-d-glucopyranoside (1) and (E)-dihydropinosylvin-3-O-β-d-glucopyranoside (2), along with the three known compounds, (E)-pinosylvin-3-O-β-d-glucopyranoside (3), dihydropinosylvin (4) and pinosylvin (5). Their structures were elucidated by spectroscopic techniques. The stilbenoids identified in the seeds of O. indicum may possess chemotaxonomic significance at the generic level. [Display omitted] •Two new stilbene derivates were isolated from the seeds of Oroxylum indicum.•Stilbenoids were reported firstly in the genus Oroxylum and Bignoniaceae.•Stilbenoids may serve chemotaxonomic significance for Oroxylum and Bignoniaceae.