The stilbenoids from Dendrobium plicatile

Seven stilbenoids were isolated from stems of Dendrobium plicatile and their structures were elucidated on the basis of spectroscopic data. Six of them were known compounds, 3-methoxy-3',5-dihydroxybibenzyl, 3,3',4'-trimethoxy-5-hydroxybibenzyl, 2-methoxy-4,7-dihydroxy-9,10-dihydrophenanthrene, 2,4-dimethoxy-3,7-dihydroxyphenanthrene, 3,4-dimethoxy-2,7-dihydroxy-9,10-dihydrophenanthrene and ephemeranthoquionone. The seventh, 2,2'-dimethoxy-4,4',7,7'-tetrahydroxy-9,9',10,10'-biphenanthrene, was a new dimer. Copyright (C) 1996 Elsevier Science Ltd