| abstract |
The present invention relates to a compound represented by the formula: n n n n n n n n n n wherein W is C(R 1 ) or N, each A is an optionally substituted aryl group or a heteroaryl group, X 1 is —NR 3 —Y 1 —, —O—, —S—, —SO—, —SO 2 — or —CHR 3 — wherein R 3 is a hydrogen atom or an optionally substituted aliphatic hydrocarbon group, or R 3 is optionally bonded to A to form an optionally substituted ring structure, R 1 is a hydrogen atom or an optionally substituted group bonded via a carbon atom, a nitrogen atom or an oxygen atom, R 2 is a hydrogen atom or optionally substituted group bonded via a carbon atom or a sulfur atom, or R 1 and R 2 , or R 2 and R 3 are optionally bonded to form an optionally substituted ring structure, or a salt thereof, and a tyrosine kinase inhibitor or an agent for the prophylaxis or treatment of cancer, which contains this compound or a prodrug thereof. |