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CAS 1 record

CAS 288-32-4

CAS 288-32-4 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 288-32-4
CAS 288-32-4PubChem CID 795

Imidazole

1H-imidazole is an imidazole tautomer which has the migrating hydrogen at position 1. It is a conjugate base of an imidazolium cation. It is a conjugate acid of an imidazolide. It is a tautomer of a 4H-imidazole. — ChEBI

IUPAC name
1H-imidazole
Molecular formula
C3H4N2
Molecular weight
68.08 g/mol
Exact mass
68.037448136 Da
XLogP3
-0.1
Topological polar surface area
28.7 Ų
Hydrogen-bond donors
1
Hydrogen-bond acceptors
1
Covalent units
1
Defined stereocentres
0

Also known as

GlyoxalineImidazolIminazoleMiazole1,3-DiazoleImutexGlyoxalin1,3-Diaza-2,4-cyclopentadiene
16 more reported names
Pyrro(b)monazoleGlioksalFormamidine, N,N'-vinylene-Pyrro[b]monazoleMethanimidamide, N,N'-1,2-ethenediyl-N,N'-vinyleneformamidine7GBN705NH1N,N'-1,2-ethenediylmethanimidamideNSC-60522CHEBI:16069RefChem:5902CHEBI:14434206-019-2USAF EK-4733Glioksal [Polish]IMD
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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 288-32-4

1 total

How CAS 288-32-4 is used on this site

CAS 288-32-4 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 288-32-4 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 288-32-4 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.

The INCI Checker accepts ingredient names, CAS numbers and EC numbers. Check this CAS number directly, then verify the result against supplier specification sheets and every linked annex condition.
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