Why does CAS 37279-54-2 appear in more than one EU cosmetic annex?

A substance identified by CAS 37279-54-2 may appear in multiple EU cosmetic regulation annexes when it is subject to different conditions in different contexts — for example, restricted under Annex III with specific conditions, while also appearing in Annex IV as an approved colorant under separate entry conditions. Each entry must be reviewed individually.

How do I check if my formula contains a substance with CAS 37279-54-2?

Use the INCI Checker on CosIng Checker with INCI names, CAS numbers or EC numbers. Paste CAS 37279-54-2 to screen it directly, then review every linked annex record and supplier document.

CAS 1 record

CAS 37279-54-2

Q: How do I use CAS 37279-54-2 for compliance screening?

Cross-reference CAS 37279-54-2 against your raw material specification sheets and CoA documents. When it appears in Annex II, verify absence. When it appears in Annex III, verify that concentration limits and product type conditions are met. All annex entries sharing this CAS number are listed on this page.

CAS 37279-54-2 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 37279-54-2

CAS 37279-54-2PubChem CID 162255

Direct Violet 48

IUPAC name: dicopper;disodium;3-[[5-(methylsulfamoyl)-2-oxidophenyl]diazenyl]-7-[[6-[[5-(methylsulfamoyl)-2-oxidophenyl]diazenyl]-5-oxido-7-sulfonatonaphthalen-2-yl]amino]-4-oxidonaphthalene-2-sulfonate

Molecular formula: C34H23Cu2N7Na2O14S4
Molecular weight: 1054.9 g/mol
Exact mass: 1052.857316 Da
Topological polar surface area: 394.0 Å²
Hydrogen-bond donors: 3
Hydrogen-bond acceptors: 21
Covalent units: 5
Defined stereocentres: 0

Also known as

G9EK8VBD7LDIRECT FAST VIOLET KMU(.MU.-((7,7'-IMINOBIS(4-HYDROXY-3-((2-HYDROXY-5-((METHYLAMINO)SULFONYL)PHENYL)AZO)-2-NAPHTHALENESULFONATO))(6-)))DICUPRATE (2-), DISODIUM SALTCUPRATE (2-), (.MU.-((7,7'-IMINOBIS(4-HYDROXY-3-((2-HYDROXY-5-((METHYLAMINO)SULFONYL)PHENYL)AZO)-2-NAPHTHALENESULFONATO))(6-)))DI-, DISODIUM SALTCUPRATE(2-), (.MU.-((7,7'-IMINOBIS(4-HYDROXY-3-((2-HYDROXY-5-((METHYLAMINO)SULFONYL)PHENYL)AZO)-2-NAPHTHALENESULFONATO))(6-)))DI-, DISODIUMCuprate(2-), (mu-((7,7'-iminobis(4-hydroxy-3-((2-hydroxy-5-((methylamino)sulfonyl)phenyl)azo)-2-naphthalenesulfonato))(6-)))di-, disodiumCuprate(2-), [.mu.-[[7,7'-iminobis[4-hydroxy-3-[[2-hydroxy-5-[(methylamino)sulfonyl]phenyl]azo]-2-naphthalenesulfonato]](6-)]]di-, disodiumRefChem:589145

12 more reported names

DIRECT VIOLET 48 [INCI](MU-((7,7'-IMINOBIS(4-HYDROXY-3-((2-HYDROXY-5-((METHYLAMINO)SULFONYL)PHENYL)AZO)-2-NAPHTHALENESULFONATO))(6-)))DICUPRATE (2-), DISODIUM SALTCUPRATE (2-), (MU-((7,7'-IMINOBIS(4-HYDROXY-3-((2-HYDROXY-5-((METHYLAMINO)SULFONYL)PHENYL)AZO)-2-NAPHTHALENESULFONATO))(6-)))DI-, DISODIUM SALTCI 29125UNII-G9EK8VBD7LEINECS 253-441-8C.I. 29125DINKHUYGJKLNQS-UHFFFAOYSA-H(mu-((7,7'-Iminobis(4-hydroxy-3-((2-hydroxy-5-((methylamino)sulfo- nyl)phenyl)azo)-2-naphthalenesulfonato))(6-)))dicuprate (2-), disodium saltCopper(2+) sodium 7,7'-azanediylbis(3-{(E)-[5-(methylsulfamoyl)-2-oxidophenyl]diazenyl}-4-oxidonaphthalene-2-sulfonate) (2/2/1)Cuprate (2-), (mu-((7,7'-iminobis(4-hydroxy-3-((2-hydroxy-5-((methylamino)sulfo- nyl)phenyl)azo)-2-naphthalenesulfonato))(6-)))di-, disodium saltDisodium (mu-((7,7'-iminobis(4-hydroxy-3-((2-hydroxy-5-(N-methylsulphamoyl)phenyl)azo)naphthalene-2-sulphonato))(6-)))dicuprate(2-)

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External database identifiers

EPA DTXSID:DTXSID20879790

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 37279-54-2

1 total

Annex

Entry

1268

(micro-((7,7'-Iminobis(4-hydroxy-3-((2-hydroxy-5-(N-methylsulphamoyl)phenyl)azo)naphthalene-2-sulphonato))(6-)))dicuprate and its salts, when used as a substan…

253-441-8

How CAS 37279-54-2 is used on this site

CAS 37279-54-2 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 37279-54-2 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.

Frequently asked questions

A substance identified by CAS 37279-54-2 may appear in multiple EU cosmetic regulation annexes when it is subject to different conditions in different contexts. For example, a substance might be restricted under Annex III with specific conditions, and the same CAS might also appear in Annex IV as an approved colorant under separate entry conditions. Each entry must be reviewed individually.

Cross-reference the CAS number against your raw material specification sheets and CoA documents. When a CAS appears in Annex II, verify absence. When it appears in Annex III, verify that concentration limits and product type conditions are met in your formulation. All annex entries sharing this CAS number are listed above.

A CAS number is assigned by the Chemical Abstracts Service (USA) and is globally recognised. An EC number is a European Commission identifier from inventories such as EINECS, ELINCS or the NLP list. Both identifiers may appear in EU cosmetic annex entries. Some substances have both, some have only one, and some older entries may have neither.

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