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CAS 98-79-3

CAS 98-79-3 matches 0 EU annex records across Annex II–VI of Regulation 1223/2009.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 98-79-3
CAS 98-79-3PubChem CID 7405

L-Pyroglutamic Acid

5-oxo-L-proline is an optically active form of 5-oxoproline having L-configuration. It has a role as an algal metabolite. It is a 5-oxoproline, a non-proteinogenic L-alpha-amino acid and a L-proline derivative. It is a conjugate acid of a 5-oxo-L-prolinate. It is an enantiomer of a 5-oxo-D-proline. — ChEBI

IUPAC name
(2S)-5-oxopyrrolidine-2-carboxylic acid
Molecular formula
C5H7NO3
Molecular weight
129.11 g/mol
Exact mass
129.042593085 Da
XLogP3
-0.8
Topological polar surface area
66.4 Ų
Hydrogen-bond donors
2
Hydrogen-bond acceptors
3
Covalent units
1
Defined stereocentres
1

Also known as

Pyroglutamic acidPidolic acid5-oxo-L-prolinepyrogluGLUTIMIC ACID(S)-(-)-2-Pyrrolidone-5-carboxylic acid5-L-OxoprolineL-Proline, 5-oxo-
16 more reported names
L-5-OxoprolinePidolidone(S)-PYROGLUTAMIC ACIDAJIDEW A-100(-)-2-Pyrrolidone-5-carboxylic acidAcide pidoliqueAcido pidolico5-Carboxy-2-pyrrolidinoneL-pca2-Pyrrolidinone-5-carboxylic acidL-5-Carboxy-2-pyrrolidinone(S)-5-Oxo-2-pyrrolidinecarboxylic acidL-5-Oxo-2-pyrrolidinecarboxylic acidGLUTIMINIC ACIDL-Pyroglutamate5-Pyrrolidinone-2-carboxylic acid
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External database identifiers

Retrieved from NIH PubChem on 2026-08-31 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Records for CAS 98-79-3

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How CAS 98-79-3 is used on this site

CAS 98-79-3 is the Chemical Abstracts Service identifier used to pin this page to a specific substance. In the current dataset, 0 EU annex records share this identifier, which helps you cross-check whether the same substance appears under one regulatory context or several.

Use this page when a supplier specification, SDS or raw-material dossier gives you CAS 98-79-3 and you need to see every linked Annex II–VI record in one place. The entry cards above are the quickest route to concentration limits, warnings, annex placement and product-type conditions.