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CAS 16279-54-2

CAS 16279-54-2 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 16279-54-2
CAS 16279-54-2PubChem CID 3570294

3-Hydroxy-4-((2-hydroxynaphthyl)azo)-7-nitronaphthalene-1-sulphonic acid

IUPAC name
3-hydroxy-4-[(2-hydroxynaphthalen-1-yl)diazenyl]-7-nitronaphthalene-1-sulfonic acid
Molecular formula
C20H13N3O7S
Molecular weight
439.4 g/mol
Exact mass
439.04742094 Da
XLogP3
4.1
Topological polar surface area
174.0 Ų
Hydrogen-bond donors
3
Hydrogen-bond acceptors
9
Covalent units
1
Defined stereocentres
0

Also known as

1-Naphthalenesulfonic acid, 3-hydroxy-4-(2-(2-hydroxy-1-naphthalenyl)diazenyl)-7-nitro-1-(2-Hydroxy-4-sulfo-6-nitro-1-naphthylazo)-2-naphthol3-hydroxy-4-[(2-hydroxynaphthyl)azo]-7-nitronaphthalene-1-sulphonic acid1-Naphthalenesulfonic acid, 3-hydroxy-4-[2-(2-hydroxy-1-naphthalenyl)diazenyl]-7-nitro-RefChem:502386240-379-1Solochrome Black AS, (free acid)C.I. Mordant Black 1, free acid
13 more reported names
C.I. Mordant Black 11-Naphthalenesulfonic acid, 3-hydroxy-4-[(2-hydroxy-1-naphthalenyl)azo]-7-nitro-1-Naphthalenesulfonic acid, 3-hydroxy-4-((2-hydroxy-1-naphthalenyl)azo)-7-nitro-EINECS 240-379-1NCIMech_00030092V9SVJ8HAEriochrome Black A, Free Acid1-(2-Hydroxy-4-sulfo-6-nitro-1-naphthylazo-2-naphtholSXYCCJAPZKHOLS-UHFFFAOYSA-NCCG-35374NCI60_0416073-hydroxy-4-(1-hydroxy-2-napthylazo)-7-nitro-1-naphthalene sulfonic acid3-Hydroxy-4-[2-(2-hydroxy-1-naphthalenyl)diazenyl]-7-nitro-1-naphthalenesulfonic 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 16279-54-2

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How CAS 16279-54-2 is used on this site

CAS 16279-54-2 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 16279-54-2 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.