The wood of Platymiscium praecox Mart. (Leguminosae-Lotoideae) contains sitosterol, 4,2',4' trihydroxychalcone, (2R)-7_hydroxyflavanone, (&)-7,4'-dihydroxytlavanone, (2S, 3S)-3,7-dihydroxyflavanone, 3,7_dihydroxyflavone, 3,7,4'-trihydroxyflavone, 6,7-dihydroxy-4'-methoxyisoflavone and 6 7 dimethoxycoumarin. It also contains three novel compounds: 7-hydroxy-4.methoxy-5-methylcoumarin, 7-U-glucosyloxy4methoxy-5-methylcoumarin and 7-hydroxy4,8-dimethoxy-5-methylcoumarin.