| abstract |
Provided are compounds useful as prophylactic or therapeutic drugs for diseases caused by abnormalities in plasma uric acid. The present invention relates to a condensed cyclic derivative represented by the following formula (I), a prodrug thereof, a salt thereof, and the like, which have xanthine oxidase inhibitory activity and are useful as a prophylactic or therapeutic drug for diseases caused by abnormal plasma uric acid levels. In formula (I), X < 1> , X < 2> is CH or N; Ring U is aryl or heteroaryl; m is an integer of 0-2, n is an integer of 0-3; R 1 is hydroxyl, amino or C 1-6 alkyl; R 2 is C 1-6 alkyl, C 1-6 alkoxyC 1-6 alkyl and the like. |