chloromethylisothiazolinone

CHEBI:53621 ·resolve ·ANTIMICROBIAL_UNSPECIFIED ·EXACT SEEDED

A 1,2-thiazole that is 4-isothiazolin-3-one bearing a methyl group on the nitrogen atom and a chlorine at C-5. It is a powerful biocide and preservative and is the major active ingredient in the commercial product KathonTM. — ChEBI

Machine-generated and unreviewed. Identity, structure and cross-references come straight from ChEBI's and CARD's own data; no curator has signed off on this record yet.

Classification

Strictly broader compounds or drug classes this molecule belongs to.

Label unavailable CHEBI:36683
Label unavailable CHEBI:48902

Chemical structure

Computed structure properties
Molecular formula	C4H4ClNOS
Charge	0
Average mass	149.602 Da
Monoisotopic mass	148.97021 Da
Source	ChEBI
InChIKey	DHNRXBZYEKSXIM-UHFFFAOYSA-N

SMILES

Cn1sc(Cl)cc1=O

InChI

InChI=1S/C4H4ClNOS/c1-6-4(7)2-3(5)8-6/h2H,1H3

Also called

5-chloro-2-methyl-1,2-thiazol-3(2H)-one (EXACT_SYNONYM)— chebi
2,3-dihydro-2-methyl-3-oxo-5-chloroisothiazole (EXACT_SYNONYM)— chebi
5-Chloro-2-methyl-4-isothiazolin-3-one (EXACT_SYNONYM)— chebi
5-chloro-2-methyl-2H-isothiazol-3-one (EXACT_SYNONYM)— chebi
CMIT (EXACT_SYNONYM)— chebi
MCI (EXACT_SYNONYM)— chebi
methylchloroisothiazolinone (EXACT_SYNONYM)— chebi

Cross-references

Identifiers for this same structure in other resources. An accession that lands on two different structures in this corpus is withheld from both rather than shown here, since it names at most one of them.

cas:26172-55-4
reaxys:1210149

Patents and articles

Documents about this compound. A patent covers a class and an article covers a topic; neither identifies a structure.

wikipedia.en:Methylchloroisothiazolinone

Activity roles

Every antimicrobial role a source asserts for this compound — the unreduced evidence behind its antimicrobial_class.

antimicrobial agent CHEBI:33281

Source concepts

Every upstream concept that resolved to this record. The merge is the product: this is what shows ChEBI and CARD are describing the same structure.

Upstream concepts merged into this record
Source	Native ID	Label	Minted CURIE	Version
CHEBI	`CHEBI:53621`	chloromethylisothiazolinone	`antibioticmech:chebi-e4c5be1542`	2026-08-30

Curation history

SEEDED_FROM_SOURCES 2026-08-30 · seed_from_sources
Seeded from data/raw/ inventories (CHEBI)
RESEEDED_FROM_SOURCES 2026-08-30 · seed_from_sources
Re-seeded from updated data/raw/ inventories
RESEEDED_FROM_SOURCES 2026-08-30 · seed_from_sources
Re-seeded from updated data/raw/ inventories
RESEEDED_FROM_SOURCES 2026-09-10 · seed_from_sources
Re-seeded from updated data/raw/ inventories

Provenance

Seeded by scripts/seed_from_sources.py from the committed inventories in data/raw/. View the record (YAML).

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