A CAS Registry Number identifies a registered substance. Check it alongside the complete peptide description; then make a separate match between the offered material, lot and certificate.
Start with the substance description
CAS assigns Registry Numbers to substances recorded in CAS REGISTRY. Preserve the complete number, including its hyphens, and compare the substance description with the peptide name, sequence and declared chemical form. A familiar trade name is not a substitute for that comparison.CAS identifier guidance (opens in a new tab)
Salt forms, terminal modifications and metal complexes are identity details. If the listing and record use different descriptions, retain that discrepancy and request clarification; do not silently replace one with the other.CAS identifier guidance (opens in a new tab)Bachem — Frequently asked questions (opens in a new tab)
A documented BPC-157 comparison
The existing BPC-157 PubChem record (CID 9941957), rechecked for this revision, associates CAS 137525-51-0 with the reference structure and sequence GEPPPGKPADDAGLV. Its formula is C62H98N16O22. Compare a listing’s full description with that record rather than extending the number to an unspecified salt or hydrate.PubChem — BPC-157, CID 9941957 (opens in a new tab)CAS identifier guidance (opens in a new tab)
| Identifier | What to compare |
|---|---|
| CAS number | Registered substance description and stated form |
| Sequence | Residue order and any explicit modifications |
| Lot number | The material identifier on the vial and report |
| Report number and revision | The complete analytical document and version |
Then read the analytical evidence
A substance identifier is not a purity or content measurement. Two lots can share a named identity while having different reports. Match the lot, vial size and sample description before interpreting the result rows.WHO certificate model (opens in a new tab)Bachem analytical guide (opens in a new tab)
A useful comparison record keeps the printed CAS number, source consulted, exact structural description and any unresolved mismatch together. Where the registry record has not been verified, say so instead of filling the gap with a number from a different form.CAS identifier guidance (opens in a new tab)
Sources and further detail
- CAS — CAS REGISTRY and Registry Number guidance (opens in a new tab)
Authoritative explanation of Registry Numbers, format and identification role. No specific commercial substance registration was verified for this article.
- Bachem — Frequently asked questions (opens in a new tab)
Salt-form explanation. Bachem's stated supply defaults describe Bachem, not every peptide supplier.
- WHO — Model certificate of analysis (opens in a new tab)
Technical Report Series 1010, Annex 4 (2018). Background on report structure; not an endorsement of this material or certificate.
- Bachem — Quality control of amino acids and peptides (opens in a new tab)
Sections on identity, purity and product content. Used for the distinction between chromatographic area and material content.
- PubChem — BPC-157, CID 9941957 (opens in a new tab)
Existing PubChem CID 9941957 source rechecked via official PUG REST on 3 October 2026. CAS 137525-51-0 appears in the ChemIDplus/EPA-backed CAS field; the structural record does not establish an unspecified supplied salt or hydrate.
Revised from the existing source dossier on 3 October 2026. Supplied-report values are document transcriptions, not independent authentication or new measurements. Source notes identify the scope of each reference; this article has not undergone independent scientific peer review.