| abstract |
A compound represented by the general formula (1) below or a pharmacologically acceptable salt thereof: n n[In the formula (1),n R 1 and R 2 may be the same or different and each represents a hydrogen atom, a halogen atom, a hydroxyl group, a carboxy group, a cyano group, an optionally substituted C 1-6 alkyl group et al.; R 3 represents a hydrogen atom; R 4 represents an optionally substituted 4- to 10-membered monocyclic heterocyclic group containing 1 to 4 heteroatoms selected from an oxygen atom, a nitrogen atom, and a sulfur atom; X represents a group represented by the following formula: —CH 2 —, —CH 2 —CH 2 —, —CH 2 —CH 2 —CH 2 —, or —CH 2 —O—CH 2 —; and Z represents a hydrogen atom or a hydroxyl group]. |