Disclosed is a compound represented by formula (1) or a pharmacologically acceptable salt thereof. (In the formula, A represents a group that is represented by formula (A-1) R1a and R1b may be the same or different and each independently represents a C1-6 alkyl group which may be substituted by one to three halogen atoms m and n each independently represents an integer of 0-5 X1 represents a hydroxyl group or an aminocarbonyl group Z1 represents a single bond or the like and R2 represents an optionally substituted C1-6 alkyl group, an optionally substituted C6-10aryl group or the like.)
