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CAS 61-90-5

CAS 61-90-5 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 61-90-5
CAS 61-90-5PubChem CID 6106

L-Leucine

L-leucine is the L-enantiomer of leucine. It has a role as a mouse metabolite, a Saccharomyces cerevisiae metabolite, a plant metabolite, an Escherichia coli metabolite, a human metabolite and an algal metabolite. It is a L-alpha-amino acid, a leucine, a pyruvate family amino acid and a proteinogenic amino acid. It is a conjugate base of a L-leucinium. It is a conjugate acid of a L-leucinate. It is an enantiomer of a D-leucine. It is a tautomer of a L-leucine zwitterion. — ChEBI

IUPAC name
(2S)-2-amino-4-methylpentanoic acid
Molecular formula
C6H13NO2
Molecular weight
131.17 g/mol
Exact mass
131.094628657 Da
XLogP3
-1.5
Topological polar surface area
63.3 Ų
Hydrogen-bond donors
2
Hydrogen-bond acceptors
3
Covalent units
1
Defined stereocentres
1

Also known as

leucine(S)-2-Amino-4-methylpentanoic acid(S)-Leucine(S)-(+)-LeucineLeucin(S)-2-Amino-4-methylvaleric acidL-alpha-Aminoisocaproic acidLEUCINE, L-
16 more reported names
LeucinumLeucinaFEMA No. 3297(2S)-alpha-leucineL-leucin2-amino-4-methylvaleric acidL-(-)-2-Amino-4-methylpentanoic acidalpha-Aminoisocaproic acidL-LeuzinLeucine, lNSC-46709(2S)-alpha-2-amino-4-methylvaleric acidGMW67QNF9CL-LeuCHEBI:15603(2S)-2-amino-4-methylpentanoate
Open full PubChem recordPubChem annotations3D structure image
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 61-90-5

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How CAS 61-90-5 is used on this site

CAS 61-90-5 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 61-90-5 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.