Studies on chemical constituents in the rhizome of Dalbergia rimosa Roxb.The chemical constituents from the ethyl acetate part of D.rimosa were isolated and purified by silica gel,MCI gel,Sephadex LH-20 gel and semi-preparative HPLC,and the stuctures were identified by spectral method.Thirteen compounds were isolated from the ethyl acetate part of the rhizome of D.rimosa and identified as dalbergiaisoflavones A,B(1,2),formononetin(3),7,4'-dimethoxyisoflavone(4),4',6,7-trimethoxyisoflavone(5),biochanin A(6),prunetin(7),7-O-methyltectorigenin(8),3'-hydroxydaidzein(9),orobol 7,3'-dimethyl ether(10),2',7-dihydroxy-4',5'-dimethoxyisoflavone(11),pruinosanone E(12),caviunin(13).Compounds 1 and 2 are new compounds,and compounds 3-13 were isolated from this plant for the first time.Compounds 9 and 11 had remarkable scavenging effect on DPPH free radicals.
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