A compound represented by the general formula (1) below or a pharmacologically acceptable salt thereof :[In the formula (1),R<；sup>；1<；/sup>；and R<；sup>；2<；/sup>；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<；sub>；1-6<；/sub>；alkyl group et al.； R<；sup>；3<；/sup>；represents a hydrogen atom； R<；sup>；4<；/sup>；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<；sub>；2<；/sub>；-, - CH<；sub>；2<；/sub>；-CH<；sub>；2<；/sub>；-, -CH<；sub>；2<；/sub>；-CH<；sub>；2<；/sub>；-CH<；sub>；2<；/sub>；-, or -CH<；sub>；2<；/sub>；-O-CH<；sub>；2<；/sub>；-； and Z represents a hydrogen atom or a hydroxyl group.]
