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A pale brown liquid with a weak garlic odor. Fenthion is an organophosphate Insecticide usually used on flying insects, such as flies and mosquitos. It works as a cholinesterase inhibitor.

Synonyms and Related Terms

o,o-dimethyl-o-[3-methyl-4-(methylthio)phenyl] phosphorothioate; Baytex [Mobay]; Entex; Tiguvon [Bayer AG]; Baycid; Bayer 29493; ENT-25540; S-1752; Lebaycid; Mercaptophos; Queletox; Talodex; Tiguvon


  • Restricted use. Toxic by ingestion, inhalation, and skin absorption.
  • Echemi: SDS

Physical and Chemical Properties

Soluble in methanol, ethanol. ether, acetone and many other organic solvents.

Insoluble in water.

Composition C10H15O3PS2
CAS 55-38-9
Density 1.250 g/ml
Molecular Weight mol. wt. = 278.33
Refractive Index 1.5698

Resources and Citations

  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 4044