| 摘要 |
The present invention provides a fused heterocyclic compound having a tyrosine kinase inhibitory action, which is represented by the formula: wherein ring A is an optionally substituted benzene ring; ring B is an optionally substituted benzoisothiazole ring; R1 is a hydrogen atom, a halogen atom, or an optionally substituted group bonded via a carbon atom, a nitrogen atom or an oxygen atom; R2 is a hydrogen atom, or an optionally substituted group bonded via a carbon atom or a sulfur atom; R3 is a hydrogen atom or an optionally substituted aliphatic hydrocarbon group; or R1 and R2, or R2 and R3 are optionally bonded to each other to form an optionally substituted ring structure; or R3 is optionally bonded to the carbon atom on ring A to form an optionally substituted ring structure; or a salt thereof.
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