Provided is a compound represented by formula (1) or a pharmacologically acceptable salt thereof. (In the formula, A is C 6-10 arylene, etc.; R 1a , R 1b and R 1c each independently is a hydrogen atom, a halogen atom, a C 1-4 alkyl group, a C 1-4 alkoxy group, etc.; R 2 is an optionally substituted C 6-10 aryl group, an optionally substituted 5- to 12-membered monocyclic or polycyclic heteroaryl group, an optionally substituted C 7-16 aralkyl group, etc.; m is 0, etc.; n is an integer of 0 to 2.)