Two new dalbergiphenols from Zhuang medicine Dalbergia rimosa Roxb
Twelve compounds were isolated from the ethyl acetate fraction of the 80％aqueous ethanol extract of the roots and stems of Dalbergia rimosa Roxb.by silica gel,MCI,Sephadex LH-20 column chromatography,and semi-preparative HPLC.Their structures were identified by spectral analysis such as UV,IR,MS,1D/2D NMR and by comparison with literature information as dalbergiquinol A(1),dalbergiquinol B(2),R-(-)-3'-hydroxy-2,4,5-trimethoxydalbergiquinol(3),neokhriol A(4),mucronulatol(5),(3R)-7,2',3'-trihydroxy-4'-methoxy-isoflavane(6),isomucronulatol(7),(3S)-violanone(8),3'-O-methylviolanone(9),eryvarin M(10),(±)-α,3,4,2',4'-pentahydroxydi-hydrochalcone(11)and(-)-butin(12).Compound 1 and 2 are new compounds,and compounds 3-12 were isolated from this plant for the first time.Compounds 1,2,4,6,8,11,12 showed good scavenging effect on DPPH free radical.
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