Pterocarpadiols A–D, Rare 6a,11b-Dihydroxypterocarpans from Derris robusta

摘要

Four hitherto unknown 6a,11b-dihydroxypterocarpans,namely pterocarpadiols A–D(1–4),were isolated from the ethanol extract of the twigs and leaves of Derris robusta.Their structures were elucidated on the basis of extensive spectroscopic analysis.Pterocarpadiols A–D are a kind of very rare 6a,11b-dihydroxypterocarpans,and their presence as markers may be helpful in chemotaxonomical classification.