MelanotanⅡ Catalog# F01-002-007 CAS No. 121062-08-6 Sequence Ac-Nle-cyclo[Asp-His-D-Phe-Arg-Trp-Lys]-NH2 Molecular Formula C 50 H 69 N 15 O 9 Molecular Weight 1024.2 Purity (HPLC) 98% min Description melanotan II is analog of the peptide hormone alpha-melanocyte stimulating hormone (α-MSH) that tend to induce skin tanning. Melanotan II has the additional effect of increasing libido.