Additionally to the cinnamylphenols described in a previous paper, wood samples of Machaerium mucronulatum and M. villosum contain isoflavones, besides (-)-duartin, (-)- and (±)-mucronulatol[(3S)- and rat-7,3' dihydroxy-2',4'-dimethoxyisoflavan], (-)-mucroquinone [(3S)-2-methoxy-5-(7-hydroxy-8-methoxychroman-3-yl)- 1,4benzoquinone] and (+)-mucronucarpan [(6aS,l laS)-2,lO-dihydroxy-3,9-dimethoxypterocarpan]. The constitutions of mucronulatol, mucroquinone and mucronucarpan were deduced by spectra and degradations, and confirmed by syntheses.