Patent ID: 8609647

Claim:
A compound of formula [I]: wherein R a is the same or different and each is: (1) C 1-6 alkyl, or (2) halogen atom, n1 is an integer selected from 0 to 4, R b is the same or different and each is: (1) C 1-6 alkyl, or (2) halogen atom, n2 is an integer selected from 0 to 4, m1 is an integer selected from 0 to 3, m2 is an integer selected from 1 to 4, X a =X b is CH═CH, X is a nitrogen atom, R c is a group selected from the following (1) to (6): (1) hydrogen atom, (2) C 1-6 alkyl optionally substituted by the same or different 1 to 5 substituents selected from the following Group A, (3) —C(═O)—R c1 , (4) —C(═O)—O—R c2 , (5) —C(═O)—NR c3 R c4 in which R c1 , R c2 , R c3 and R c4 are the same or different and each is: (i) hydrogen atom, or (ii) C 1-6 alkyl optionally substituted by the same or different 1 to 5 substituents selected from the following Group A, and (6) a group of formula: in which Y a is a group selected from the following (i) to (iii): (i) C 1-6 alkylene, (ii) —C(═O)—, and (iii) —C(═O)—O—, Ring T is: (i) C 6-10 aryl, (ii) C 3-10 cycloalkyl, or (iii) saturated monoheterocyclyl wherein the saturated monoheterocyclyl comprises 1 to 4 heteroatoms selected from nitrogen atom, oxygen atom or sulfur atom as well as carbon atoms and the number of the constituent ring atoms is 3 to 7, R c5 is the same or different and each is: (i) cyano, or (ii) nitro, p is an integer selected from 0 to 4, Group A is selected from the group consisting of: (a) hydroxyl, (b) C 1-6 alkoxy, (c) cyano, (d) C 1-6 alkoxycarbonyl, (e) C 1-6 alkylcarbonyloxy, and (f) C 2-6 alkenyloxy, or a pharmaceutically acceptable salt thereof, or a solvate of the compound or salt thereof.