The present invention provides a compound represented by the formula: wherein R1a is a hydrogen atom, R2a is a C1-6 alkyl group substituted by a group represented by &mdash；NR6a&mdash；CO&mdash；(CH2)n&mdash；SO2&mdash； optionally halogenated C1-4 alkyl wherein n is an integer of 1 to 4, R6a is a hydrogen atom or a C1-4 alkyl group, and &mdash；(CH2)n&mdash； is optionally substituted by C1-4 alkyl, R3a is a hydrogen atom or a C1-6 alkyl group, R4a is a halogen atom or a C1-6 alkyl group, R5a is a halogen atom or a C1-6 alkyl group, and Xa is a hydrogen atom or a halogen atom, or a salt thereof. The compound of the present invention has a superior tyrosine kinase inhibitory action, is highly safe, and is sufficiently satisfactory as a pharmaceutical product.
