| abstract |
The present invention provides a fused heterocyclic compound having a tyrosine kinase inhibitory action, which is represented by the formula:n nwherein nring A is an optionally substituted benzene ring; nring B is an optionally substituted benzoisothiazole ring; nR 1 is a hydrogen atom, a halogen atom, or an optionally substituted group bonded via a carbon atom, a nitrogen atom or an oxygen atom; nR 2 is a hydrogen atom, or an optionally substituted group bonded via a carbon atom or a sulfur atom; nR 3 is a hydrogen atom or an optionally substituted aliphatic hydrocarbon group; nor nR 1 and R 2 , or R 2 and R 3 are optionally bonded to each other to form an optionally substituted ring structure; nor nR 3 is optionally bonded to the carbon atom on ring A to form an optionally substituted ring structure; nor a salt thereof. |