| 摘要 |
PROBLEM TO BE SOLVED: To provide a compound useful as a tyrosine kinase inhibitor or a cancer preventive/therapeutic agent. SOLUTION: This useful compound expressed by formula or a salt of the same is provided. In the formula, W expresses C(R<SP>1</SP>) or N; A expresses an aryl group or a heteroaryl group each of which may be substituted; X<SP>1</SP>expresses NR<SP>3</SP>-Y<SP>1</SP>-, -O-, -S-, -SO-, -SO<SB>2</SB>- or -CHR<SP>3</SP>-; R<SP>1</SP>expresses H or a group which may be bonded through C, N or O, or substituted; R<SP>2</SP>expresses H or a group which may be bonded through C or S, or substituted; R<SP>1</SP>and R<SP>2</SP>, or R<SP>2</SP>and R<SP>3</SP>may form a cyclic structure which may be substituted by bonding to each other, respectively. COPYRIGHT: (C)2009,JPO&INPIT
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