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CAS 521-58-4 (free base)

CAS 521-58-4 (free base) 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 521-58-4
CAS 521-58-4PubChem CID 98312

alpha-Amino-3-carboxy-1-hydroxy-gamma,5-dioxo-5H-pyrido(3,2-a)phenoxazine-11-butanoic acid

IUPAC name
11-(3-amino-3-carboxypropanoyl)-1,5-dioxo-4H-pyrido[3,2-a]phenoxazine-3-carboxylic acid
Molecular formula
C20H13N3O8
Molecular weight
423.3 g/mol
Exact mass
423.07026438 Da
XLogP3
-2.7
Topological polar surface area
185.0 Ų
Hydrogen-bond donors
4
Hydrogen-bond acceptors
11
Covalent units
1
Defined stereocentres
0

Also known as

XanthommatinXanthomattin3BMW3J9GSZNSC-10084911-(3-amino-3-carboxypropanoyl)-1-hydroxy-5-oxo-5H-pyrido[3,2-a]phenoxazine-3-carboxylic acidCHEBI:16550alpha-Amino-3-carboxy-1-hydroxy-gamma,5-dioxo-5H-pyrido[3,2-a]phenoxazine-11-butanoic acid11-(3-amino-3-carboxypropanoyl)-1-hydroxy-5-oxo-5H-pyrido(3,2-a)phenoxazine-3-carboxylic acid
6 more reported names
RefChem:915476NSC 100849I+/--Amino-3-carboxy-1-hydroxy-I(3),5-dioxo-5H-pyrido[3,2-a]phenoxazine-11-butanoic acid4H-Pyrido[3,2-a]phenoxazine-11-butanoic acid, alpha-amino-3-carboxy-1,5-dihydro-gamma,1,5-trioxo-5H-Pyrido(3,2-a)phenoxazine-11-butanoic acid, alpha-amino-3-carboxy-1-hydroxy-gamma,5-dioxo- (VAN)5H-Pyrido[3,2-a]phenoxazine-11-butanoic acid, alpha-amino-3-carboxy-1-hydroxy-gamma,5-dioxo-
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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 521-58-4 (free base)

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How CAS 521-58-4 (free base) is used on this site

CAS 521-58-4 (free base) 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 521-58-4 (free base) 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.