Melanotan-2 (MT-2) is a cyclic heptapeptide analog of alpha-MSH and MC1R/MC4R agonist. With the molecular formula C₅₀H₆₉N₁₅O₉ and a molecular weight of 1024.2 g/mol (CAS: 121062-08-6), it structurally mimics endogenous peptides while extending its sequence.
Ac-Nle-cyclo[Asp-His-D-Phe-Arg-Trp-Lys]-NH2


