Thannilignan glucoside and 2-(β-glucopyranosyl)-3-isoxazolin-5-one derivative, two new compounds isolated from Terminalia bellirica.

Two new compounds, thannilignan 9-O-β-glucoside (1) and 2-(β-glucopyranosyl)-3-isoxazolin-5-one derivative (2), and seven known compounds were isolated from the methanol extract of Terminalia bellirica leaves, collected in Bangladesh. The structures of the compounds were elucidated using spectroscopic analysis. Among these isolated compounds, corilagin (3) was cytotoxic against human gastric adenocarcinoma cell line AGS at an IC 50 of 20.8 μM, and β-D-glucopyranose 1,3,6-trigallate (4) exhibited the ability to overcome tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) resistance.