Why does CAS 68391-31-1 appear in more than one EU cosmetic annex?

A substance identified by CAS 68391-31-1 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.

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CAS 1 record

CAS 68391-31-1

Q: How do I use CAS 68391-31-1 for compliance screening?

Cross-reference CAS 68391-31-1 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 68391-31-1 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 68391-31-1

CAS 68391-31-1PubChem CID 94631

3-[(4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo]-N,N,N-trimethylanilinium chloride

IUPAC name: trimethyl-[3-[(3-methyl-5-oxo-1-phenyl-4H-pyrazol-4-yl)diazenyl]phenyl]azanium chloride

Molecular formula: C19H22ClN5O
Molecular weight: 371.9 g/mol
Exact mass: 371.1512880 Da
Topological polar surface area: 57.4 Å²
Hydrogen-bond donors: 0
Hydrogen-bond acceptors: 5
Covalent units: 2
Defined stereocentres: 0

Also known as

Basic Yellow 133-((4,5-Dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo)-N,N,N-trimethylanilinium chlorideRefChem:488488Basic yellow 57trimethyl-[3-[(3-methyl-5-oxo-1-phenyl-4H-pyrazol-4-yl)diazenyl]phenyl]azanium;chlorideBasic Yellow 19Benzenaminium, 3-((4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo)-N,N,N-trimethyl-, chlorideBenzenaminium, 3-[2-(4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)diazenyl]-N,N,N-trimethyl-, chloride

11 more reported names

N,N,N-Trimethyl-3-((3-methyl-5-oxo-1-phenyl-4,5-dihydro-1H-pyrazol-4-yl)diazenyl)benzenaminium chlorideBenzenaminium, 3-[(4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo]-N,N,N-trimethyl-, chlorideCI 12719COLIPA C10UNII-4N63359G0XNWKBFCIAPOSTKG-UHFFFAOYSA-MEINECS 269-943-55-Hydroxy-3-methyl-1-phenyl-4-(3'-trimethylammoniophenylazo)pyrazole, chloride3-((4,5-Dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo)-N,N,- N-trimethylbenzenaminium chlorideBenzenaminium, 3-((4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo)-N,N,- N-trimethyl-, chlorideN,N,N-Trimethyl-3-[(3-methyl-5-oxo-1-phenyl-4,5-dihydro-1H-pyrazol-4-yl)diazenyl]anilinium chloride

Open full PubChem record PubChem annotations 3D structure image

External database identifiers

EPA DTXSID:DTXSID50275928

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 68391-31-1

1 total

Annex

III

Entry

262

BASIC YELLOW 57

Benzenaminium, 3-[(4,5-dihydro- 3-methyl-5-oxo-1-phenyl-1H- pyrazol-4-yl)azo]-N,N,Ntrimethyl-, chloride

Hair dye substance in non-oxidative hair dye products

269-943-5

Max concentration

How CAS 68391-31-1 is used on this site

CAS 68391-31-1 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 68391-31-1 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 68391-31-1 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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