The all-trans configuration of (+)-neo-olivil from Urtica dioica was e
stablished by NMR-spectroscopy. After transforming it to (-)-epipinore
sinol and (-)-pinoresinol with trimethylorthoformate and H2SO4 the abs
olute configuration was determined as 7R,7'R,8S,8'S. (C) 1997 Elsevier
Science Ltd.