PTP1B inhibitors from Saussrurea lappa

A new lignan glycoside, named 1,5-dihydroxypinoresinol-4'-O-beta-d-glucopyranoside (1), has been isolated from the EtOH extract of the roots of Saussurea lappa, together with twenty known compounds: (+)-1-hydroxypinoresinol-1-O-beta-D-glucopyranoside (2), fraxiresinol-4'-O-beta-D-glucopyranoside (3), (-)-olivil-4''-O-beta-D-glucopyranoside (4), 4-allyl-2,6-dimethoxybenzene-1-O-beta-D-glucopyranoside, syringin, costunolide-15-O-beta-D-glucopyranoside, chlorogenic acid, aloe-emodin-8-O-beta-D-glucopyranoside (5), rhein-8-O-beta-D-glucopyranoside (6), chrysophanol (7), emodin, dehydrocostus lactone, costunolide, beta-costic acid, reynosin, arbusculin A, alpha-cyclocostunolide, beta-cyclocostunolide, santamarine and magnolialide. Three Anthraquinones (5-7) showed moderate bioactivity against human Protein Tyrosine Phosphatase 1B (hPTP1B) in vitro.