Lignans from Wikstroemia hainanensis

The structures and conformations of three new lignans, wikstrone (1), wikstroemol (2), and wikstroemone (3) - isolated from the aerial parts of Wikstroemia hainanensis - were determined. together with those of twelve known compounds, including erythro-guaiacylglycerol-beta-O-4'-sinapyl ether (4). The configuration of 4, falsely assigned in the literature (threo configuration), was redetermined. and the compound was identified as erythro-guaiacylglycerol-beta-O-4'-sinapyl ether.