Afamelanotide

Chemical Information
Afamelanotide is a first-in-class, synthetic, 13-amino acid peptide analogue of the endogenous alpha melanocyte-stimulating hormone (α-MSH). It differs structurally from its endogenous counterpart by only two amino acids - these structural differences improve biological efficacy by imparting a greater affinity for its target and a longer biological half-life. Afamelanotide is currently the only approved drug therapy used in the management of erythropoietic protoporphyria, having received approval in the EU in December 2014 and subsequent FDA approval in October 2019. Despite its relatively recent approval, afamelanotide has been available for use as an orphan drug in both the US and EU since 2008.
| CAS Number | 75921-69-6 |
| PubChem CID | 16197727 |
| IUPAC Name | (4S)-4-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-acetamido-3-hydroxypropanoyl]amino]-3-(4-hydroxyphenyl)propanoyl]amino]-3-hydroxypropanoyl]amino]hexanoyl]amino]-5-[[(2S)-1-[[(2R)-1-[[(2S)-1-[[(2S)-1-[[2-[[(2S)-6-amino-1-[(2S)-2-[[(2S)-1-amino-3-methyl-1-oxobutan-2-yl]carbamoyl]pyrrolidin-1-yl]-1-oxohexan-2-yl]amino]-2-oxoethyl]amino]-3-(1H-indol-3-yl)-1-oxopropan-2-yl]amino]-5-carbamimidamido-1-oxopentan-2-yl]amino]-1-oxo-3-phenylpropan-2-yl]amino]-3-(1H-imidazol-5-yl)-1-oxopropan-2-yl]amino]-5-oxopentanoic acid |
| Molecular Formula | C78H111N21O19 |
| Molecular Weight | 1646.8 |
| XLogP | -3.5 |
| Topological Polar Surface Area | 643 |
| Hydrogen Bond Donor Count | 23 |
| Hydrogen Bond Acceptor Count | 22 |
| Rotatable Bond Count | 51 |
| Heavy Atom Count | 118 |
| Formal Charge | 0 |
| Complexity | 3360 |
| Property | Value |
|---|---|
| Molecular Weight | 1646.8 |
| XLogP3 | -3.5 |
| Hydrogen Bond Donor Count | 23 |
| Hydrogen Bond Acceptor Count | 22 |
| Rotatable Bond Count | 51 |
| Exact Mass | 1645.83651040 |
| Monoisotopic Mass | 1645.83651040 |
| Topological Polar Surface Area | 643 Ų |
| Heavy Atom Count | 118 |
| Formal Charge | 0 |
| Complexity | 3360 |
| Isotope Atom Count | 0 |
| Defined Atom Stereocenter Count | 12 |
| Undefined Atom Stereocenter Count | 0 |
| Defined Bond Stereocenter Count | 0 |
| Undefined Bond Stereocenter Count | 0 |
| Covalently-Bonded Unit Count | 1 |
| Compound Is Canonicalized | Yes |
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