What is the molecular weight of retatrutide?
The molecular weight of Retatrutide is 4731.3 g/mol on the registry record used for identity. The molecular formula is C221H342N46O68. CAS Registry Number 2381089-83-2. It is classed as a peptide (lipidated). Synonyms include LY3437943. Laboratories use this mass when confirming identity by mass spectrometry.
Mass. The expected average mass for identity confirmation is 4731.3 g/mol.
Formula. C221H342N46O68.
Analytical note. 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
Retatrutide: reference facts
3 Retatrutide values, each linked to its public source; see the Retatrutide reference page.
| Synonyms | LY3437943 (pubchem.ncbi.nlm.nih.gov) |
|---|---|
| Compound class | peptide (lipidated) (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 | £16.93 | £3.39 | lowest other £20.95 across 2 UK sellers |
| 10 mg | £24.99 | £2.50 | lowest other £51.99 across 2 UK sellers |
| 15 mg | £37.99 | £2.53 | lowest other £85.00 across 1 UK sellers |
| 20 mg | £48.99 | £2.45 | lowest other £93.99 across 2 UK sellers |
| 30 mg | £66.99 | £2.23 | lowest other £85.00 across 4 UK sellers |
| 40 mg | £88.99 | £2.22 | no same-size match |
| 50 mg | £108.99 | £2.18 | no same-size match |
| 60 mg | £128.99 | £2.15 | no same-size match |
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.
Typical analytical method
| HPLC column | C18 reversed-phase (300 A pore, C4/C8 suitable for large/lipidated) |
|---|---|
| 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) and 280 nm (Trp/Tyr present) |
General literature method. The lot CoA records the method actually used. How to read an HPLC chromatogram.
Related questions
Lyophilised storage on file: Retatrutide
From the Sable storage reference (lyophilised material only; temperature, light, moisture). Literature basis is linked per row. See peptide storage.
| Compound | Lyophilised storage | Light / notes |
|---|---|---|
| Retatrutide | -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: Retatrutide
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.
| Compound | HPLC column / detection | MS / expected ion |
|---|---|---|
| Retatrutide | C18 reversed-phase (300 A pore, C4/C8 suitable for large/lipidated); 214-220 nm (peptide bond) and 280 nm (Trp/Tyr present) | ESI-MS (positive mode); LC-MS for identity; [M+3H]3+ ~1578.1; [M+4H]4+ ~1183.8; [M+5H]5+ ~947.3; [M+6H]6+ ~789.6 |
Research use only. Not a medicine. Not for human or veterinary use.