Disclosed is a compound represented by the formula (I) below or a pharmacologically acceptable salt thereof. Also disclosed is a use of the compound or salt as a pharmaceutical product.
(In the formula, Ar
1
represents an imidazolyl group which may be substituted with a C
1-6
alkyl group; Ar
2
represents a phenyl group which may be substituted with a C
1-6
alkoxy group; X
1
represents a single bond; R
1
and R
2
respectively represent a C
1-6
alkyl group or the like which may be substituted with a substituent such as a 5- to 14-membered aromatic heterocyclic group; and R
3
represents a hydrogen atom or the like.)