---
title: "What is the amino acid sequence of SS-31? | Sable Peptides"
description: "SS-31 is a research peptide whose amino acid sequence is on the public registry record. The published sequence is D-Arg-Dmt-Lys-Phe-NH2."
canonical: https://www.sablepeptides.co.uk/questions/ss-31-sequence
publisher: Sable Peptides Limited (UK company 17488610)
note: Research use only. Not for human or veterinary use.
---

# What is the amino acid sequence of SS-31?

SS-31 is a research peptide whose amino acid sequence is on the public registry record. The published sequence is D-Arg-Dmt-Lys-Phe-NH2. Its molecular formula is C32H49N9O5. Its molecular weight is 639.8 g/mol. The CAS Registry Number is 736992-21-5. PubChem CID 11764719 indexes the structure.

Sequence. D-Arg-Dmt-Lys-Phe-NH2

Class. peptide.

Formula. C32H49N9O5.

Mass. 639.8 g/mol.

Analytical note. Identity confirmation by mass spectrometry uses the mass calculated from the formula. Sable's release specification is ≥99% by HPLC with identity confirmed against the expected mass (quality page). Research use only. Not a medicine. Not for human or veterinary use.

## Sources

-   [https://pubchem.ncbi.nlm.nih.gov/compound/11764719](https://pubchem.ncbi.nlm.nih.gov/compound/11764719)

## SS-31: reference facts

8 SS-31 values, each linked to its public source; see the [SS-31 reference page](/ref/ss-31).

| Synonyms | elamipretide; MTP-131; Bendavia (pubchem.ncbi.nlm.nih.gov) |
| --- | --- |
| Compound class | peptide (pubchem.ncbi.nlm.nih.gov) |
| CAS Registry Number | 736992-21-5 (pubchem.ncbi.nlm.nih.gov) |
| Sequence | D-Arg-Dmt-Lys-Phe-NH2 (pubchem.ncbi.nlm.nih.gov) |
| Molecular formula | C32H49N9O5 (pubchem.ncbi.nlm.nih.gov) |
| Molecular weight | 639.8 g/mol (pubchem.ncbi.nlm.nih.gov) |
| PubChem CID | 11764719 (pubchem.ncbi.nlm.nih.gov) |
| Storage (lyophilised) | -20 °C, dry, protected from light (sigmaaldrich.com) |

## Sizes and prices at Sable

| Vial | Price | Per mg | UK same-size check (2026-10-16) |
| --- | --- | --- | --- |
| 5 mg | £25.99 | £5.20 | no same-size match |
| 10 mg | £19.93 | £1.99 | lowest other £19.95 across 13 UK sellers |

Multi-vial pricing on the same item: 3+ vials 10% off, 5+ vials 15% off, 10+ vials 20% off. Every lot has a certificate of analysis: [CoA library](/coa).

## Typical analytical method

| HPLC column | C18 reversed-phase (100-120 A pore) |
| --- | --- |
| Mobile phase | A: water + 0.1% TFA; B: acetonitrile + 0.1% TFA; linear gradient (e.g. 5-65% B over 20-30 min) |
| Detection | 214-220 nm (peptide bond) |

General literature method. The lot CoA records the method actually used. [How to read an HPLC chromatogram](/learn/how-to-read-an-hplc-chromatogram).

## Related questions

-   [What is the structure of SS-31?](/questions/ss-31-structure)

## Lyophilised storage on file: SS-31

From the Sable storage reference (lyophilised material only; temperature, light, moisture). Literature basis is linked per row. See [peptide storage](/learn/peptide-storage-and-solubility).

| Compound | Lyophilised storage | Light / notes |
| --- | --- | --- |
| SS-31 | -20 C long term (-80 C acceptable), sealed and desiccated; 2-8 C for weeks | protect from light; no specific sequence liabilities identified from sequence data on file (source) |

## Typical analytical method: SS-31

Reference HPLC and MS conditions from the Sable analytical-methods file; a lot's CoA states the method actually used. See [how to read a CoA](/guides/how-to-read-a-coa).

| Compound | HPLC column / detection | MS / expected ion |
| --- | --- | --- |
| SS-31 | C18 reversed-phase (100-120 A pore); 214-220 nm (peptide bond) | ESI-MS (positive mode); LC-MS for identity; [M+1H]1+ ~640.8; [M+2H]2+ ~320.9; [M+3H]3+ ~214.3 |

Research use only. Not a medicine. Not for human or veterinary use.