Kissei Pharmaceutical Co., Ltd.

Masato Lizuka

Kazuo Shimizu

Yusuke Onda

Compounds useful as agents for the prevention or treatment of a disease associated with abnormal serum uric acid level and the like. Fused heterocyclic derivatives represented by the following formula (I) having xanthine oxidase inhibitory activities and useful as agents for the prevention or treatment of a disease associated with abnormality of serum uric acid level, or prodrugs thereof, or pharmaceutically acceptable salts thereof. In the formula (I), ring U represents Caryl or the like; Rindependently represents a hydrogen atom, a hydroxy group, Calkyl or the like; m represents an integral number from 1 to 2; ring Q represents 5-membered heteroaryl; n represents an integral number from 1 to 3; Rindependently represents a hydrogen atom, a halogen atom, Calkyl or the like. 

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Matsumoto, Japan

Masato Lizuka