Resomelagon methanesulfonate (AP1189 methanesulfonate) is the methanesulfonate salt form of Resomelagon. Resomelagon methanesulfonate is an orally active melanocortin receptor ( MR ) agonist. Resomelagon methanesulfonate induces ERK1/2 phosphorylation and Ca 2+ mobilization. Resomelagon methanesulfonate exhibits anti-inflammatory activity in mouse peritonitis and peritonitis model. Resomelagon methanesulfonate can be used for obesity and chronic inflammation research.