Why does CAS 2164-08-1 appear in more than one EU cosmetic annex?

A substance identified by CAS 2164-08-1 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.

How do I check if my formula contains a substance with CAS 2164-08-1?

Use the INCI Checker on CosIng Checker with INCI names, CAS numbers or EC numbers. Paste CAS 2164-08-1 to screen it directly, then review every linked annex record and supplier document.

CAS 1 record

CAS 2164-08-1

Q: How do I use CAS 2164-08-1 for compliance screening?

Cross-reference CAS 2164-08-1 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 2164-08-1 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 2164-08-1

CAS 2164-08-1PubChem CID 16559

Lenacil

Lenacil is a cyclopentapyrimidine that is 6,7-dihydro-1H-cyclopenta[d]pyrimidine-2,4(3H,5H)-dione substituted by a cyclohexyl group at position 3. It has a role as a herbicide, an agrochemical, a xenobiotic and an environmental contaminant. — ChEBI

IUPAC name: 3-cyclohexyl-1,5,6,7-tetrahydrocyclopenta[d]pyrimidine-2,4-dione

Molecular formula: C13H18N2O2
Molecular weight: 234.29 g/mol
Exact mass: 234.136827821 Da
XLogP3: 1.7
Topological polar surface area: 49.4 Å²
Hydrogen-bond donors: 1
Hydrogen-bond acceptors: 2
Covalent units: 1
Defined stereocentres: 0

Also known as

Venzar3-Cyclohexyl-5,6-trimethyleneuracilDu Pont 634X58DK6S8KXCHEBI:64073-Cyclohexyl-6,7-dihydro-1H-cyclopentapyrimidine-2,4(3H,5H)-dione3-Cyclohexyl-1,5,6,7-tetrahydrocyclopentapyrimidine-2,4(3H)-dionehexylure

16 more reported names

3-cyclohexyl-1,5,6,7-tetrahydrocyclopenta(d)pyrimidine-2,4-dioneRefChem:152739218-499-0ElbatanHexilureBuracylAdol (pesticide)Herbicide 634Uracil 634LenacileExperimental herbicide 6343-cyclohexyl-6,7-dihydro-1H-cyclopenta[d]pyrimidine-2,4(3H,5H)-dione3-Cyclohexyl-5,6-trimethylenuracil1H-Cyclopentapyrimidine-2,4(3H,5H)-dione, 6,7-dihydro-3-cyclohexyl-3-Cyclohexyl-6,7-dihydro-1H-cyclopentapyrimidine-2,4-(3H,5H)-dione1H-Cyclopentapyrimidine-2,4(3H,5H)-dione, 3-cyclohexyl-6,7-dihydro-

Open full PubChem record PubChem annotations 3D structure image

External database identifiers

ChEBI:CHEBI:6407
ChEMBL:CHEMBL1522462
EPA DTXSID:DTXSID9042093
PubMed:19103453
PubMed:18413279
PubMed:17390814
PubMed:16957849
PubMed:16628949
PubMed:15884806
PubMed:15823336
PubMed:15053526
PubMed:12701413
PubMed:12685608
PubMed:12531276

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 2164-08-1

1 total

Annex

Entry

1590

Lenacil (ISO); 3-cyclohexyl-6,7-dihydro-1H-cyclopenta[d]pyrimidine-2,4(3H,5H)-dione

218-499-0

CMR

How CAS 2164-08-1 is used on this site

CAS 2164-08-1 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 2164-08-1 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 2164-08-1 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.

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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