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SergRussu · CC BY-SA 4.0

Melanotan-II

Identity

Field	Value
IUPAC name	(3S,6S,9R,12S,15S,23S)-15-[[(2S)-2-acetamidohexanoyl]amino]-9-benzyl-6-[3-(diaminomethylideneamino)propyl]-12-(1H-imidazol-5-ylmethyl)-3-(1H-indol-3-ylmethyl)-2,5,8,11,14,17-hexaoxo-1,4,7,10,13,18-hexazacyclotricosane-23-carboxamide
SMILES	CCCC[C@@H](C(=O)N[C@H]1CC(=O)NCCCC[C@H](NC(=O)[C@@H](NC(=O)[C@@H](NC(=O)[C@H](NC(=O)[C@@H](NC1=O)CC2=CN=CN2)CC3=CC=CC=C3)CCCN=C(N)N)CC4=CNC5=CC=CC=C54)C(=O)N)NC(=O)C
InChI	InChI=1S/C50H69N15O9/c1-3-4-16-36(59-29(2)66)44(69)65-41-25-42(67)55-20-11-10-18-35(43(51)68)60-47(72)39(23-31-26-57-34-17-9-8-15-33(31)34)63-45(70)37(19-12-21-56-50(52)53)61-46(71)38(22-30-13-6-5-7-14-30)62-48(73)40(64-49(41)74)24-32-27-54-28-58-32/h5-9,13-15,17,26-28,35-41,57H,3-4,10-12,16,18-25H2,1-2H3,(H2,51,68)(H,54,58)(H,55,67)(H,59,66)(H,60,72)(H,61,71)(H,62,73)(H,63,70)(H,64,74)(H,65,69)(H4,52,53,56)/t35-,36-,37-,38+,39-,40-,41-/m0/s1
InChIKey	JDKLPDJLXHXHNV-MFVUMRCOSA-N

Chemistry

Field	Value
Compound class	Cyclic heptapeptide (α-MSH analog)
Formula	C₅₀H₆₉N₁₅O₉
Molecular weight	1024.18
CAS	121062-08-6
PubChem	PubChem CID 92432 (opens in a new tab)

2D structure

PubChem 2D depiction · CID 92432

3D structure

Computed conformer: one plausible shape of a flexible molecule, not a measured structure · RDKit

Additional properties

Computed
Property	Value
Exact mass	1023.54026884 Da
Monoisotopic mass	1023.54026884 Da
XLogP3	0
Topological polar surface area	385 Å²
Hydrogen bond donors	13
Hydrogen bond acceptors	11
Rotatable bonds	17
Heavy atoms	74

Also known as

MT-II, Melanotan (MT)-II, Melatonan

Identifiers

Registry identifiers
Registry	Value
UNII	UPF5CJ93X7 (opens in a new tab)
DSSTox	DTXSID90153135 (opens in a new tab)
ChEBI	CHEBI:195326 (opens in a new tab)
Wikidata	Q423855 (opens in a new tab)

Sources

Data sources
Source	Kind	Retrieved
PubChem CID 92432 (opens in a new tab)	PubChem	Oct 12, 2026
Computed conformer (RDKit ETKDGv3 + MMFF94)	Internal	Oct 12, 2026

Products containing this compound

Listed products
Product	Milligrams
Melanotan-II	entire fill

SergRussu · CC BY-SA 4.0

Melanotan-II | True Adam