Abstract:

A new bibenzyl derivative, moniliformine, along with six known compounds, was isolated from a orchid Dendrobium moniliforme (L.) Sw. The new compound was identified as 3,4-dihydroxy-5,4''-dimethoxy bibenzyl on the basis of 1D and 2D NMR experiments. The six known compounds were determined to be a-dihydropicrotoxinin, n-triacontyl p-hydroxy-cis-cinnamate, n-octacostyl ferulate, b-sitosterol, daucosterol and n-nonacosane, respectively. Among them, a-dihydropicrotoxinin was isolated for the first time from the plant kingdom.

Key words: Dendrobium moniliforme, moniliformine, a-dihydropicrotoxinin