Reference

Peptide molecular weights, formulas and CAS numbers

Formula, molecular weight and CAS number for 32 compounds in the catalog, from PubChem. Each compound links to its kit page. For any other sequence, use the peptide molecular weight calculator.

Compound	Formula	MW (g/mol)	CAS	PubChem
5-Amino-1MQ Value for the 5-amino-1-methylquinolinium cation; the counter-ion is stated on the lot COA.	C₁₀H₁₁N₂⁺	159.21	—	950107
AOD-9604	C₇₈H₁₂₃N₂₃O₂₃S₂	1815.1	221231-10-3	71300630
ARA-290	C₅₁H₈₄N₁₆O₂₁	1257.3	1208243-50-8	91810664
BPC-157	C₆₂H₉₈N₁₆O₂₂	1419.5	137525-51-0	9941957
Cagrilintide	C₁₉₄H₃₁₂N₅₄O₅₉S₂	4409	1415456-99-3	171397054
Cartalax Ala-Glu-Asp tripeptide.	C₁₂H₁₉N₃O₈	333.29	85806-95-7	87815447
CJC-1295 with DAC	C₁₆₅H₂₆₉N₄₇O₄₆	3647.2	—	91971820
Dihexa	C₂₇H₄₄N₄O₅	504.7	1401708-83-5	129010512
DSIP	C₃₅H₄₈N₁₀O₁₅	848.8	62568-57-4	68816
Epitalon Ala-Glu-Asp-Gly tetrapeptide.	C₁₄H₂₂N₄O₉	390.35	307297-39-8	219042
GHK-Cu Copper(II) complex of GHK. The GHK peptide alone is C14H24N6O4, 340.38 g/mol (CAS 49557-75-7).	C₁₄H₂₃CuN₆O₄⁺	402.92	89030-95-5	71587328
Glutathione Reduced glutathione (GSH).	C₁₀H₁₇N₃O₆S	307.33	70-18-8	124886
Hexarelin	C₄₇H₅₈N₁₂O₆	887.0	140703-51-1	6918297
Ipamorelin	C₃₈H₄₉N₉O₅	711.9	170851-70-4	9831659
Kisspeptin-10	C₆₃H₈₃N₁₇O₁₄	1302.4	374675-21-5	25240297
KPV Lys-Pro-Val tripeptide.	C₁₆H₃₀N₄O₄	342.43	67727-97-3	125672
L-Carnitine	C₇H₁₅NO₃	161.20	541-15-1	10917
LL-37	C₂₀₅H₃₄₀N₆₀O₅₃	4493	154947-66-7	16198951
Melanotan I	C₇₈H₁₁₁N₂₁O₁₉	1646.8	75921-69-6	16197727
Melanotan II	C₅₀H₆₉N₁₅O₉	1024.2	121062-08-6	92432
MOTS-C	C₁₀₁H₁₅₂N₂₈O₂₂S₂	2174.6	1627580-64-6	146675088
NAD+	C₂₁H₂₇N₇O₁₄P₂	663.4	53-84-9	5892
Oxytocin	C₄₃H₆₆N₁₂O₁₂S₂	1007.2	50-56-6	439302
Pinealon Glu-Asp-Arg tripeptide.	C₁₅H₂₆N₆O₈	418.40	175175-23-2	10273502
PT-141	C₅₀H₆₈N₁₄O₁₀	1025.2	189691-06-3	9941379
Selank	C₃₃H₅₇N₁₁O₉	751.9	129954-34-3	11765600
Semax	C₃₇H₅₁N₉O₁₀S	813.9	80714-61-0	9811102
Sermorelin	C₁₄₉H₂₄₆N₄₄O₄₂S	3357.9	86168-78-7	16132413
SLU-PP-332	C₁₈H₁₄N₂O₂	290.3	303760-60-3	5338394
SS-31	C₃₂H₄₉N₉O₅	639.8	736992-21-5	11764719
Tesamorelin	C₂₂₁H₃₆₆N₇₂O₆₇S	5136	218949-48-5	16137828
Thymosin Alpha-1	C₁₂₉H₂₁₅N₃₃O₅₅	3108.3	62304-98-7	16130571
TB-500 (Ac-LKKTETQ fragment) The TB-500 name is also used in the trade for full-length thymosin beta-4 (C212H350N56O78S, about 4963 g/mol); the mass-spec line on the lot COA shows which material a lot is.	C₃₈H₆₈N₁₀O₁₄	889.0	885340-08-9	62707662

How to use these numbers

Molecular weights are PubChem computed average masses for the parent compound. A lot supplied as an acetate or TFA salt, or as a metal complex, weighs more per molecule, so supplier figures differ in the decimals. CAS numbers appear only where PubChem lists one unambiguous registry number; a dash means it was not confirmed.

The value that identifies a specific lot is the observed mass on its certificate of analysis. The COA guide explains how to compare it with the theoretical mass, and every kit ships with its lot COA. Blends, proteins and compounds without a clean PubChem record are not listed.

Questions

What is the molecular weight of BPC-157?

1419.5 g/mol, molecular formula C62H98N16O22 (PubChem CID 9941957). Its CAS number is 137525-51-0.

What is the CAS number for TB-500?

PubChem lists 885340-08-9 for the Ac-LKKTETQ fragment (C38H68N10O14, 889.0 g/mol). The TB-500 name is also used for full-length thymosin beta-4, so check the mass-spec line on the lot COA.

What is the molecular weight of GHK-Cu?

PubChem gives 402.92 g/mol for the copper complex (C14H23CuN6O4+). The GHK peptide alone is 340.38 g/mol.

Why do suppliers list different molecular weights for the same peptide?

Salt forms (acetate or TFA), counter-ions, metal complexes and rounding all move the number. The figures here are PubChem computed values for the parent compound; the observed mass on a lot COA is what identifies the lot.

For laboratory research use only. Not for human or animal consumption.