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CAS 1 record

CAS 3442-21-5

CAS 3442-21-5 matches 1 EU annex record across Annex II–VI of Regulation 1223/2009.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 3442-21-5
CAS 3442-21-5PubChem CID 135666389

Disodium 5-[[4-[(7-amino-1-hydroxy-3-sulphonato-2-naphthyl)azo]-1-naphthyl]azo]salicylate

IUPAC name
disodium;6-amino-3-[[4-[(3-carboxy-4-hydroxyphenyl)diazenyl]naphthalen-1-yl]diazenyl]-4-oxidonaphthalene-2-sulfonate
Molecular formula
C27H17N5Na2O7S
Molecular weight
601.5 g/mol
Exact mass
601.06440764 Da
Topological polar surface area
222.0 Ų
Hydrogen-bond donors
3
Hydrogen-bond acceptors
12
Covalent units
3
Defined stereocentres
0

Also known as

Direct black 51NRJ266RH4NDIRECT BLACK 51, 5-SALICYLATE-Disodium 5-((4-((7-amino-1-hydroxy-3-sulphonato-2-naphthyl)azo)-1-naphthyl)azo)salicylateBenzoic acid, 5-(2-(4-(2-(7-amino-1-hydroxy-3-sulfo-2-naphthalenyl)diazenyl)-1-naphthalenyl)diazenyl)-2-hydroxy-, sodium salt (1:2)Benzoic acid, 5-[2-[4-[2-(7-amino-1-hydroxy-3-sulfo-2-naphthalenyl)diazenyl]-1-naphthalenyl]diazenyl]-2-hydroxy-, sodium salt (1:2)RefChem:589406222-351-0
3 more reported names
UITPPLCTSITQIX-JRLGXOQISA-LBenzoic acid, 5-[[4-[(7-amino-1-hydroxy-3-sulfo-2-naphthalenyl)azo]-1-naphthalenyl]azo]-2-hydroxy-, disodium saltDisodium 5-[(E)-{4-[(E)-(7-amino-1-hydroxy-3-sulfonatonaphthalen-2-yl)diazenyl]naphthalen-1-yl}diazenyl]-2-hydroxybenzoate
Open full PubChem recordPubChem annotations3D structure image
External database identifiers

Retrieved from NIH PubChem on 2026-09-02 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Records for CAS 3442-21-5

1 total
No records found for this CAS number.

How CAS 3442-21-5 is used on this site

CAS 3442-21-5 is the Chemical Abstracts Service identifier used to pin this page to a specific substance. In the current dataset, 1 EU annex record shares 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 3442-21-5 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.