Lab tools

Peptide identity index

The peptide identity index tells you whether two names used for research peptides refer to the same molecule. Look up a catalog name, a CAS number, or an alias. Compare a second name when a vial, a paper, or a COA uses a different label.

Mass values computed from sequence are for checking an HPLC-MS report. This page does not calculate reconstitution volumes or human doses. Pair it with a lot-linked Certificate of Analysis and the 12-point COA audit.

Compound A

Pinealon

175175-23-2

Compound B

Epithalon

307297-39-8

Observed mass from a COA

Not the same molecule

EDR versus AEDG. Short Khavinson peptides, not the same residue set.

Peptide

Pinealon

View specs

CAS: 175175-23-2
Formula: C14H22N4O9
Catalog mass: 389.39 Da
Sequence avg: 418.41 Da
Monoisotopic: 418.1812 Da
Sequence: Glu-Asp-Arg

Sequence average (418.41 Da) differs from the catalog mass (389.39 Da). Read the lot COA for the figure that lot used.

Expected ions

[M+H]+

419.1885

[M+2H]2+

210.0979

[M+3H]3+

140.401

Presentations

Capsules

COA documents PubChem CAS search

Often confused with

Epithalon

Peptide

Epithalon

View specs

CAS: 307297-39-8
Formula: C14H22N4O9
Catalog mass: 390.35 Da
Sequence avg: 390.35 Da
Monoisotopic: 390.1387 Da
Sequence: Ala-Glu-Asp-Gly

Expected ions

[M+H]+

391.146

[M+2H]2+

196.0766

[M+3H]3+

131.0535

COA documents PubChem CAS search

Often confused with

Pinealon

How the index decides

Catalog CAS, formula, and sequence come from Tetrava lot identity tables. Monoisotopic mass and expected ions are calculated only when the sequence parses as standard residues plus common caps (acetyl, amide, Aib, Nle, pGlu). Heavily modified GLP-1 analogs stay as catalog text.

TB-500 is the main trap. Supplier tables often reuse the CAS and 4,963 Da mass of full-length thymosin beta-4 on a vial whose sequence is Ac-LKKTETQ. This index splits those identities on purpose.

Research use only. Not for human or veterinary consumption.