Absolute configuration of (+)-pinoresinol 4-O-[6″-O-galloyl]-β-d-glucopyranoside, macarangiosides E, and F isolated from the leaves of Macaranga tanarius

A lignan and two megastigmane glucosides were isolated from the leaves of Macaranga tanarius together with 15 known compounds. Their structures were elucidated by spectroscopic and chemical analyses. The absolute stereochemistry of macarangiosides B and C isolated previously were also determined. DPPH radical-scavenging activity was investigated for these compounds.