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

CJC-1295 with DAC

863288-34-0

Compound B

CJC-1295 without DAC

446262-90-4

Observed mass from a COA

Not the same molecule

Drug-affinity complex changes mass, clearance, and the CAS number.

Peptide

CJC-1295 with DAC

View specs

CAS: 863288-34-0
Formula: C165H269N47O46
Catalog mass: 3,647.28 Da
Sequence avg: Not computed
Monoisotopic: Not computed
Sequence: Tyr-D-Ala-Asp-Ala-Ile-Phe-Thr-Gln-Ser-Tyr-Arg-Lys-Val-Leu-Ala-Gln-Leu-Ser-Ala-Arg-Lys-Leu-Leu-Gln-Asp-Ile-Leu-Ser-Arg-Lys(DAC)-NH2

Sequence notation is too modified to compute ions here. Use the catalog mass and the COA report together.

COA documents PubChem CAS search

Often confused with

CJC-1295 without DAC

Peptide

CJC-1295 without DAC

View specs

CAS: 446262-90-4
Formula: C152H252N44O42
Catalog mass: 3,367.95 Da
Sequence avg: 3,367.94 Da
Monoisotopic: 3,365.8936 Da
Sequence: Tyr-D-Ala-Asp-Ala-Ile-Phe-Thr-Gln-Ser-Tyr-Arg-Lys-Val-Leu-Ala-Gln-Leu-Ser-Ala-Arg-Lys-Leu-Leu-Gln-Asp-Ile-Leu-Ser-Arg-NH2

Expected ions

[M+H]+

3,366.9009

[M+2H]2+

1,683.9541

[M+3H]3+

1,122.9718

COA documents PubChem CAS search

Often confused with

CJC-1295 with DAC

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.