Why does CAS 541-20-8 appear in more than one EU cosmetic annex?

A substance identified by CAS 541-20-8 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 541-20-8?

Use the INCI Checker on CosIng Checker with INCI names, CAS numbers or EC numbers. Paste CAS 541-20-8 to screen it directly, then review every linked annex record and supplier document.

CAS 1 record

CAS 541-20-8

Q: How do I use CAS 541-20-8 for compliance screening?

Cross-reference CAS 541-20-8 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 541-20-8 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 541-20-8

CAS 541-20-8PubChem CID 10919

Pentamethonium Bromide

Pentamethonium bromide is the bromide salt of pentamethonium. It is a ganglion blocker and exhibits antihypertensive activity. It has a role as a vasodilator agent and an antihypertensive agent. It is a bromide salt and a quaternary ammonium salt. It contains a pentamethonium. — ChEBI

IUPAC name: trimethyl-[5-(trimethylazaniumyl)pentyl]azanium dibromide

Molecular formula: C11H28Br2N2
Molecular weight: 348.16 g/mol
Exact mass: 348.05987 Da
Topological polar surface area: 0.0 Å²
Hydrogen-bond donors: 0
Hydrogen-bond acceptors: 2
Covalent units: 3
Defined stereocentres: 0

Also known as

LytensiumPentamethonium dibromideBromuro de pentametonioBromure de pentamethoniumPentamethonii bromidumPentametonio bromuroPentamethylenebis(trimethylammonium bromide)0UX03A6JJC

16 more reported names

alpha,omega-Bis(trimethylammonium)pentane dibromideNSC-148343CHEBI:134839Pentamethylenebis[trimethylammonium bromide]pentamAthonium (cation)RefChem:171394208-771-7PenthoniumC 5N1,N1,N1,N5,N5,N5-hexamethylpentane-1,5-diaminium bromideEINECS 208-771-7Pentametonio bromuro [DCIT]C 5 (VAN)Pentamethonium bromide [INN:BAN]Pentamethonii bromidum [INN-Latin]UNII-0UX03A6JJC

Open full PubChem record PubChem annotations 3D structure image

External database identifiers

ChEBI:CHEBI:134839
ChEMBL:CHEMBL2107007
EPA DTXSID:DTXSID001351676

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 541-20-8

1 total

Annex

Entry

120

N,N'-Pentamethylenebis(trimethylammonium) salts, e.g. pentamethonium bromide (INN)

208-771-7

How CAS 541-20-8 is used on this site

CAS 541-20-8 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 541-20-8 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 541-20-8 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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