CAS Number: 121062-08-6 Molecular Weight: 1022.56 Salt Form: TFA Purity: >96% Sequence (3-letter): Ac-Nle-cyclo(Asp-His-D-Phe-Arg-Trp-Lys-NH2) Sequence (1-letter): Ac-(Nle)DHFRWK-NH2 Storage: -20 ?C or below ?-melanocyte stimulating hormone (?-MSH) is a hormone and neuropeptide which stimulates melanogenesis. Alpha MSH Ac-Nle4 c[Asp5, D-Phe7, Lys10] (4-10) amide is a cyclic, synthetic ?-MSH analog also known as Melanotan II. It acts as an antagonist of melanocortin-3 and -4 recpetors. It can be used in obesity research and has been shown to inhibit feeding in mouse models.