Conrauinones A and B, two new isoflavones from stem bark of Millettia conraui

Two new isoflavones, named conrauinones A (1) and B (2), have been isolated from the stem bark of Millettia conraui, in addition to known 5- methoxydurmillone. The structures of the new compounds were determined by spectroscopic analysis including 2D NMR techniques as 5,6,2'-trimethoxy- 4',5'-(methylenedioxy)-2',2'-dimethylpyrano[5',6':7,8]isoflavone (1) and 6- methoxy-3',4'-(methylenedioxy)-7-O-[(E)-3',7'-dimethyl-7'-ol-2',5'- octadienyl]isoflavone (2).