PT-141

PT-141 (bremelanotide) is a synthetic cyclic heptapeptide belonging to the melanocortin peptide family. It was derived from the research compound Melanotan II and first described in the early 2000s. The molecule features a lactam bridge — a cyclic bond between amino acid side chains — that constrains it into a ring shape. It has the molecular formula C50H68N14O10, a weight of 1,025.2 g/mol, and CAS number 189691-06-3. Classified as a melanocortin receptor ligand, it is structurally related to compounds in the MC1R through MC5R family. Supplied as a white to off-white lyophilized powder, soluble in water. This product is strictly for research purposes only.