sulfamoyl, methanesulfonyl, ethanesulfonyl, propanesulfonyl, methanesulfinyl, ethanesulfinyl or propanesulfinyl group, or pharmacologically acceptable salts thereof; (30) compounds according to any one of (1) to (29) wherein R6 is a hydrogen atom, a fluorine atom or a methoxy group, or pharmacologically acceptable salts thereof; (31) compounds according to any one of (1) to (29) wherein R6 is a hy