Pharmaceutical compositions

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PROBLEM TO BE SOLVED : To provide a pharmaceutical composition comprising a novel pyrrolidine compound having melanocortin receptor agonist activity or a pharmacologically acceptable salt thereof as an active ingredient.SOLUTION : There is provided a pyrrolidine derivative represented by the formula [I] or a pharmacologically acceptable salt thereof. [The ring A is a substituted/unsubstituted aryl group or the like; Ris a substituted/unsubstituted alkyl group or the like; Ris a halogen atom or the like; Ris an alkyl group substituted with a substituted/unsubstituted aryl group or the like; Ris H, an alkyl group or a substituted/unsubstituted nitrogen-containing aliphatic heterocyclic ring in which Rand Rare bonded to each other in the terminal and may partially contain a double bond.]SELECTED DRAWING : None