Lignans from the bark of Zanthoxylum simulans.

Investigation on the EtOAc extract of the bark ofZanthoxylum simulansled to the isolation of four new lignans including zanthoxylumin A (1), zanthoxylumin B (2), ( − )-magnolin (3), and ( − )-pinoresinol-di-3,3-dimethylallyl ether (4). Their structures were established by comprehensive analysis of the spectral data, especially 1D and 2D NMR spectra. [ABSTRACT FROM AUTHOR]