Four new dihydrostilbene glycosides and their α-glucosidase inhibitory effect from Camellia sinensis var. assamica

Four new dihydrostilbene glycosides, assastilbosides A–D (1-4), along with seven known compounds, 5,4′-dihydroxydihydrostilbene 3-O-β-d-glucopyranoside (5), 3,5-dihydroxydihydrostilbene 4′-O-β-d-glucopyranoside (6), 3,5-dihydroxydihydrostilbene 4′-O-[6′′-O-(4′′′-methoxy)galloyl]-β-d-glucopyranoside (7), 3,5-dimethoxydihydrostilbene 4′-O-α-l-rhamnopyranosyl-(1→6)-β-d-glucopyranoside (8), (­)-epicatechin (9), (­)-epicatechin 3-O-gallate (10), and...