Why does CAS 77-78-1 appear in more than one EU cosmetic annex?

A substance identified by CAS 77-78-1 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 77-78-1?

Use the INCI Checker on CosIng Checker with INCI names, CAS numbers or EC numbers. Paste CAS 77-78-1 to screen it directly, then review every linked annex record and supplier document.

CAS 1 record

CAS 77-78-1

Q: How do I use CAS 77-78-1 for compliance screening?

Cross-reference CAS 77-78-1 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 77-78-1 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 77-78-1

CAS 77-78-1PubChem CID 6497

Dimethyl Sulfate

Dimethyl sulfate is the dimethyl ester of sulfuric acid. It has a role as an alkylating agent and an immunosuppressive agent. — ChEBI

IUPAC name: dimethyl sulfate

Molecular formula: C2H6O4S
Molecular weight: 126.13 g/mol
Exact mass: 125.99867984 Da
XLogP3: -0.3
Topological polar surface area: 61.0 Å²
Hydrogen-bond donors: 0
Hydrogen-bond acceptors: 4
Covalent units: 1
Defined stereocentres: 0

Also known as

dimethylsulfateDimethyl sulphateDimethyl monosulfateSulfuric acid, dimethyl esterDimethylsulfatSulfuric acid dimethyl esterSulfate dimethyliqueDimethylsulfaat

16 more reported names

DimetilsolfatoDMS (methyl sulfate)Dwumetylowy siarczanSulfato de dimetiloMethyle (sulfate de)Sulfate de dimethyleRCRA waste number U103Dimethylester kyseliny siroveSulfate de methyleJW5CW40Z50AI3-52118NSC-56194CHEBI:59050Dimethyl ester of sulfuric acidRefChem:5764DMS(METHYL SULFATE)

Open full PubChem record PubChem annotations 3D structure image

External database identifiers

ChEBI:CHEBI:59050
ChEMBL:CHEMBL162150
EPA DTXSID:DTXSID5024055
PubMed:22913637
PubMed:22707838
PubMed:22685659
PubMed:22667821
PubMed:22666407
PubMed:22654517
PubMed:22606223
PubMed:22496887
PubMed:22474303
PubMed:22412831
PubMed:22412807
PubMed:22401667

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 77-78-1

1 total

Annex

Entry

750

Dimethyl sulphate

201-058-1

CMR

How CAS 77-78-1 is used on this site

CAS 77-78-1 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 77-78-1 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 77-78-1 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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