Robinetin is the main polyphenol of the heartwood of Intsia bijuga and is accompanied by smaller amounts of 3,5,4'-tri- and 3,5,3',4'-tetra-hydroxystilbenes, dihydromyricetin, myricetin and naringenin. The wood contains large amounts of water soluble polymers including leucocyanidin. The stilbenes are absent from the sapwood. Samples of I. bijugu and I. palembanica from several countries revealed differences in composition.