XANTHINOXIDASEINHIBITOREN

摘要

The invention relates to compounds of the following formula (I) or their salts: in which R<1> represents OR<4> or others, in which R<4> is an alkyl group having 1-8 carbon atoms which may have a substituent or the like; R<2> is halogen, nitro, cyano, carboxyl, or the like; R<3> is hydrogen, halogen, hydroxyl, amino, carboxyl, or the like; X is NR<11>, oxygen, or sulfur, in which R<11> is hydrogen, or an alkyl group having 1-8 carbon atom which may have a substituent; and each of Y and Z is CR<12> or nitrogen, in which R<12> has the same meaning as R<3> above, and a xanthine oxidase inhibitor containing the compound as an active ingredient.