Patent ID: 8895552

Claim:
A compound of formula (1), or a pharmaceutically acceptable salt thereof: [wherein A is C 6-10 arylene, or 5- or 6-membered monocyclic heteroarylene selected from the group of the following group: R 1a , R 1b and R 1c are each independently, (1) hydrogen atom, (2) deuterium atom, (3) halogen atom, (4) cyano group, (5) C 1-4 alkyl group (in which the group may be optionally substituted by (a) 1 to 3 halogen atom(s), (b) C 1-4 alkoxy (in which the group may be optionally substituted by 1 to 3 halogen atom(s)), (c) C 3-6 cycloalkyl, (d) C 3-6 cycloalkoxy, or (e) heterocycle), (6) C 1-4 alkoxy group (in which the group may be optionally substituted by (a) 1 to 3 halogen atom(s), (b) C 1-4 alkoxy (in which the group may be optionally substituted by 1 to 3 halogen atom(s)), (c) C 3-6 cycloalkyl, or (d) C 3-6 cycloalkoxy), (7) C 3-6 cycloalkyl group, (8) C 3-6 cycloalkoxy group, (9) heterocyclic oxy group, or (10) C 7-16 aralkyloxy group; R 2 is optionally substituted C 6-10 aryl group, optionally substituted 5- to 12-membered monocyclic or polycyclic heteroaryl group, optionally substituted C 7-16 aralkyl group, optionally substituted 5- to 12-membered monocyclic or polycyclic heteroaryl-C 1-6 alkyl group, optionally substituted heterocycle group, or C 1-6 alkyl group (in which the alkyl group may be optionally substituted by optionally substituted C 6-10 aryloxy); m is 0 or 1; n is an integer of 0 to 2.]