---
title: "What is the molecular formula of LL-37? | Sable Peptides"
description: "LL-37 has the molecular formula C205H340N60O53. The corresponding molecular weight is 4493.0 g/mol. CAS Registry Number 154947-66-7. PubChem CID 16198951."
canonical: https://www.sablepeptides.co.uk/questions/ll-37-molecular-formula
publisher: Sable Peptides Limited (UK company 17488610)
note: Research use only. Not for human or veterinary use.
---

# What is the molecular formula of LL-37?

LL-37 has the molecular formula C205H340N60O53. The corresponding molecular weight is 4493.0 g/mol. CAS Registry Number 154947-66-7. PubChem CID 16198951. Synonyms include cathelicidin antimicrobial peptide; CAMP (134-170). The expected mass for identity confirmation by mass spectrometry is derived from this formula.

Formula. C205H340N60O53.

Sequence. LLGDFFRKSKEKIGKEFKRIVQRIKDFLRNLVPRTES

Analytical note. The expected mass for identity confirmation by mass spectrometry is derived from this 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/16198951](https://pubchem.ncbi.nlm.nih.gov/compound/16198951)

## LL-37: reference facts

8 LL-37 values, each linked to its public source; see the [LL-37 reference page](/ref/ll-37).

| Synonyms | cathelicidin antimicrobial peptide; CAMP (134-170) (pubchem.ncbi.nlm.nih.gov) |
| --- | --- |
| Compound class | peptide (pubchem.ncbi.nlm.nih.gov) |
| CAS Registry Number | 154947-66-7 (pubchem.ncbi.nlm.nih.gov) |
| Sequence | LLGDFFRKSKEKIGKEFKRIVQRIKDFLRNLVPRTES (pubchem.ncbi.nlm.nih.gov) |
| Molecular formula | C205H340N60O53 (pubchem.ncbi.nlm.nih.gov) |
| Molecular weight | 4493.0 g/mol (pubchem.ncbi.nlm.nih.gov) |
| PubChem CID | 16198951 (pubchem.ncbi.nlm.nih.gov) |
| Storage (lyophilised) | -20 °C, dry, protected from light (sigmaaldrich.com) |

## Calculated sequence properties

Computed from the listed sequence. See the [methodology](/data/methodology).

| Length | 37 residues |
| --- | --- |
| Theoretical pI | 11.35 (calculated from sequence) |
| Net charge at pH 7 | 5.98 (calculated) |

## Sizes and prices at Sable

| Vial | Price | Per mg | UK same-size check (2026-10-16) |
| --- | --- | --- | --- |
| 5 mg | £19.93 | £3.99 | lowest other £19.95 across 8 UK sellers |
| 10 mg | £34.99 | £3.50 | 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](/coa).

## 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) |

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 molecular weight of LL-37?](/questions/ll-37-molecular-weight)
-   [What is the amino acid sequence of LL-37?](/questions/ll-37-sequence)
-   [What does LL-37 dissolve in?](/questions/ll-37-solubility)
-   [How stable is lyophilised LL-37?](/questions/ll-37-stability-lyophilised)

## Lyophilised storage on file: LL-37

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 |
| --- | --- | --- |
| LL-37 | -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: LL-37

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 |
| --- | --- | --- |
| LL-37 | C18 reversed-phase (300 A pore, C4/C8 suitable for large/lipidated); 214-220 nm (peptide bond) | ESI-MS (positive mode); LC-MS for identity; [M+3H]3+ ~1498.7; [M+4H]4+ ~1124.3; [M+5H]5+ ~899.6; [M+6H]6+ ~749.8 |

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