Disclosed is a compound represented by the following general formula (I), wherein R1 represents an aryl group having 6-10 carbon atoms or a heteroaryl group which may have, as a substituent, a group selected from an alkyl group having 1-8 carbon atoms, an alkyl group having 1-8 carbon atoms which is substituted with a halogen atom, an alkoxy group having 1-8 carbon atoms, an alkoxy group having1-8 carbon atoms which is substituted with an alkoxy group having 1-8 carbon atoms, an alkoxycarbonyl group having 2-8 carbon atoms, a formyl group, a carboxyl group, a halogen atom, a hydroxyl group, a nitro group, a cyano group, an amino group, an aryl group having 6-10 carbon atoms and an aryloxy group having 6-10 carbon atoms; R2 represents a cyano group, a nitro group or the like; R3 represents an hydroxyl group or the like; X represents an oxygen atom, a sulfur atom or the like; and Y represents an oxygen atom or a sulfur atom. Also disclosed is a xanthine oxidase inhibitor containing such a compound.