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CAS 1 record

CAS 126-85-2

CAS 126-85-2 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 126-85-2
CAS 126-85-2PubChem CID 9335

Mechlorethamine Oxide

Nitrogen mustard N-oxide is a nitrogen mustard. — ChEBI

IUPAC name
2-chloro-N-(2-chloroethyl)-N-methylethanamine oxide
Molecular formula
C5H11Cl2NO
Molecular weight
172.05 g/mol
Exact mass
171.0217694 Da
XLogP3
0.9
Topological polar surface area
18.1 Ų
Hydrogen-bond donors
0
Hydrogen-bond acceptors
1
Covalent units
1
Defined stereocentres
0

Also known as

Nitrogen mustard N-oxide2,2'-Dichloro-N-methyldiethylamine-N-oxide2Q86QAR1PNMethylbis(beta-chloroethyl)amine N-oxideEthanamine, 2-chloro-N-(2-chloroethyl)-N-methyl-, N-oxideNSC-141949RefChem:166098Nitrogen mustard (HN-2), N-oxide
16 more reported names
Oxy-NH2HN2 amine oxideHN2 oxide mustardN-Oxyd-lost [German]N-Oxyd-mustard [German]N-Oxyd-mustardNitrogen mustard amine oxideMethyl-dichlorethylamine oxideCCRIS 449UNII-2Q86QAR1PNMethyl-bis(beta-chloroethyl)amine oxideBRN 1754386N-Methyl-di-2-chloroethylamine-N-oxideDiethylamine, 2,2'-dichloro-N-methyl-, oxideDiethylamine, 2,2'-dichloro-N-methyl-, N-oxidebis(2-chloroethyl)methylamine oxide
Open full PubChem recordPubChem annotations3D structure image
External database identifiers

Evidence from additional scientific databases

NIH PubChem PUG-View
Exact identifier match9335

Attributed physical-property, hazard, environmental and use annotations.

  • Signal: Danger Source: NITE-CMC
  • GHS Hazard Statements: H340: May cause genetic defects [Danger Germ cell mutagenicity]; H351: Suspected of causing cancer [Warning Carcinogenicity] Source: NITE-CMC
  • Precautionary Statement Codes: P203, P280, P318, P405, and P501 (click each P-code to see the statement) Source: NITE-CMC

Mapped by: Existing checksum-valid CAS to unique PubChem CID match. Retrieved: 2026-08-31. Open source record

Scientific classifications and hazard annotations provide context and do not replace the market-specific regulatory decision shown above.

Additional source coverage and match status
SourceResultChecked
NIH PubChem PUG-ViewExact match2026-08-31

A recorded no-match is useful evidence that the source was checked; it is not a claim that the substance does not exist elsewhere.

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 126-85-2

1 total

How CAS 126-85-2 is used on this site

CAS 126-85-2 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 126-85-2 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 126-85-2 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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