An object of the present invention is to provide a compound having a V2 receptor agonistic activity. Provided is a pharmaceutical composition which contains, as an active ingredient, a compound represented by the general formula (I) described below: [wherein R 1 is the formula described below: (wherein A is a lower alkylene group which may be substituted with a lower alkyl group, or the like； R 6 is a hydrogen atom, or the like； R 7 is a hydroxyl group, an aromatic heterocyclic group which may be substituted with a lower alkyl group, a carbamoyl group, or the like) ； R 2 is a hydrogen atom or a lower alkyl group； R 3 is a lower alkyl group which may be substituted with 1 to 3 fluorine atoms, or a halogen atom； R 4 is a five-membered aromatic monocyclic heterocyclic group, a five-membered non-aromatic monocyclic heterocyclic group, or the like, (provided that each of these heterocyclic groups contains at least one nitrogen atom and may be substituted with a lower alkyl group) ； and R 5 is a lower alkyl group, a halogen atom, or the like], or a pharmacologically acceptable salt thereof.
