Background: Xanthine oxidase is an enzyme that catalyzes the formation of uric acid. Empirically, many people have used the root of the yellow wood as a natural antihyperuricemia medicine. Phytochemical tests were carried out on the ethanol extract of the leaves and roots of Kayu kuning, both of which contained almost the same secondary metabolites. The leaves of Kayu kuning (Arcangelisia flava…