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Substance Name: MCPA-thioethyl [BSI:ISO]
RN: 25319-90-8
UNII: XWH1737181

Classification Codes

  • Agricultural Chemical
  • Herbicide

Molecular Formula

  • C11-H13-Cl-O2-S

Molecular Weight

  • 244.7407
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Names and Synonyms

Name of Substance

  • MCPA-thioethyl [BSI:ISO]


  • 2-Methyl-4-chlorophenoxythiol acetic acid S-ethyl ester
  • EINECS 246-831-4
  • Ethylester kyseliny 4-chlor-2-tolyloxythiooctove
  • Ethylester kyseliny 4-chlor-2-tolyloxythiooctove [Czech]
  • Herbit
  • HOK 7501
  • MCPA-thioethyl
  • Phenothiol
  • S-Ethyl ((4-chloro-o-tolyl)oxy)thioacetate (8CI)
  • S-Ethyl (4-chloro-2-methylphenoxy)ethanethioate (9CI)
  • Tripion CB
  • UNII-XWH1737181
  • Zero one

Systematic Names

  • Acetic acid, ((4-chloro-o-tolyl)oxy)thio-, S-ethyl ester
  • Ethanethioic acid, (4-chloro-2-methylphenoxy)-, S-ethyl ester
  • Ethanethioic acid, (4-chloro-2-methylphenoxy)-, S-ethyl ester (9CI)
  • S-Ethyl (4-chloro-2-methylphenoxy)ethanethioate

Registry Numbers

CAS Registry Number

  • 25319-90-8


  • XWH1737181

System Generated Number

  • 0025319908

Structure Descriptors








Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
mouse LD50 intraperitoneal 1027mg/kg (1027mg/kg)   Japan Pesticide Information. Vol. (40), Pg. 32, 1982.
mouse LD50 oral 750mg/kg (750mg/kg)   Pesticide Manual. Vol. 9, Pg. 536, 1991.
quail LD50 oral > 1gm/kg (1000mg/kg)   Pesticide Manual. Vol. 9, Pg. 636, 1991.
rat LD50 intraperitoneal 530mg/kg (530mg/kg)   "Prehled Prumyslove Toxikologie; Organicke Latky," Marhold, J., Prague, Czechoslovakia, Avicenum, 1986Vol. -, Pg. 1014, 1986.
rat LD50 oral 790mg/kg (790mg/kg)   Pesticide Manual. Vol. 9, Pg. 536, 1991.

Physical Properties

Physical Property Value Units Temp (deg C) Source
Melting Point 41.5 deg C   EXP
log P (octanol-water) 4.05 (none)   EXP
Water Solubility 2.3 mg/L 25 EXP
Vapor Pressure 1.58E-04 mm Hg 20 EXP
Henry's Law Constant 2.21E-05 atm-m3/mole 25 EST
Atmospheric OH Rate Constant 1.71E-11 cm3/molecule-sec 25 EST

Physical property data is provided to ChemIDplus by SRC, Inc.