Three New Benzophenone Glucosides from the Leaves of Planchonella obovata

Chemical investigation of the EtOH extract of the leaves of Planchonella obovata resulted in the isolation of four benzophenone glucosides, 1 – 4 , of which three, 2 – 4 , are new chemical entities together with five known flavonol glycosides. Their structures were elucidated by spectroscopic analysis. Among the isolated compounds, iriflophenone 2‐ O ‐(2,6‐di‐ O ‐galloyl)‐ β ‐ D ‐glucopyranoside ( 4 ) showed some activity (91.4 and 15.0% inhibition at 100 and 10 μg/ml, resp.) against the α ‐glucosidase of Bacillus stearothermophilus.