MT-2 is a synthetic melanocortin-family peptide of seven amino acids. What sets it apart structurally is that it is built as a closed ring rather than a straight chain — a cyclic peptide.
Vestrand provides it one production lot at a time, each made ready for third-party purity work, with the finished certificate posted to the compound's verification page.
That ring is the thing worth knowing. Most peptides are open chains; tying this one into a loop gives it a more compact, defined shape than its length alone would suggest, and it is that topology, not the residue order, that makes the molecule what it is. It is supplied as a crystalline solid.
For laboratory research use only. Not for human or veterinary use.