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Insecticides and acaricides

Fenthion

Also known as Lebaycid, Spotton, Baytex

CAS 55-38-9Formula C10H15O3PS2Molar mass 278.34 g/molEC 200-231-9
GHS signal word: Danger. Pictograms: Acute toxicity (severe), Serious health hazard, Hazardous to the environment 22 suppliers listed
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Fenthion chemical structure, C10H15O3PS2, CAS 55-38-9
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Colorless liquid
Melting point
7 °C
Boiling point
87 °C
Density
Relative density (water = 1): 1.25
Flash point
170 °C
HS code
293090
Category
Insecticides and acaricides
UN number
UN 3018
Illustrative photo, clear liquid in a volumetric flask on a laboratory bench
Typical packagingIllustrative packaging image, not the actual product

What is Fenthion?

Plain description, key identifiers and synonyms

Fenthion is an organic thiophosphate that is O,O-dimethyl hydrogen phosphorothioate in which the hydrogen atom of the hydroxy group is replaced by a 3-methyl-4-(methylsulfanyl)phenyl group. It exhibits acaricidal and insecticidal activities. It has a role as an acaricide, an insecticide, an agrochemical, an avicide, an EC 3.1.1.8 (cholinesterase) inhibitor and an EC 3.1.1.7 (acetylcholinesterase) inhibitor. It is functionally related to a 4-(methylsulfanyl)-m-cresol.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
dimethoxy-(3-methyl-4-methylsulfanylphenoxy)-sulfanylidene-λ5-phosphane
CAS number
55-38-9 CAS number cross-checked
EC number
200-231-9
Molecular formula
C10H15O3PS2
UNII
BL0L45OVKT
MDL number
MFCD00055449
InChIKey
PNVJTZOFSHSLTO-UHFFFAOYSA-N
InChI
InChI=1S/C10H15O3PS2/c1-8-7-9(5-6-10(8)16-4)13-14(15,11-2)12-3/h5-7H,1-4H3
SMILES (canonical and isomeric)
CC1=C(C=CC(=C1)OP(=S)(OC)OC)SC

Synonyms

  • Lebaycid
  • Spotton
  • Baytex
  • Queletox
  • Baycid
  • Tiguvon
  • Entex
  • Fenthione
  • Phenthion
  • Figuron
  • Talodex
  • Sulfidophos
  • Fenthion-methyl
  • Bayer 29493
  • Pro-Spot
  • Fenthion 4E
  • MPP (pesticide)
  • Bay-Bassa
  • Bayer 9007
  • Bayer S-1752
  • OMS 2
  • 4-Methylmercapto-3-methylphenyl dimethyl thiophosphate
  • BAY 29493
  • ENT 25,540
  • O,O-Dimethyl-O-4-(methylmercapto)-3-methylphenyl thiophosphate
Show all 38 synonyms
  • O,O-Dimethyl O-4-(methylmercapto)-3-methylphenyl phosphorothioate
  • O,O-Dimethyl O-4-methylthio-m-tolyl phosphorothioate
  • Phosphorothioic acid, O,O-dimethyl O-(3-methyl-4-(methylthio)phenyl) ester
  • O,O-Dimethyl O-(4-(methylthio)-m-tolyl) phosphorothioate
  • O,O-Dimethyl O-(4-methylthio-3-methylphenyl) thiophosphate
  • O,O-Dimethyl O-(4-methylthio-3-methylphenyl) phosphorothioate
  • O,O-Dimethyl O-(3-methyl-4-methylmercaptophenyl)phosphorothioate
  • m-Cresol, 4-(methylthio)-, O-ester with O,O-dimethyl phosphorothioate
  • O,O-Dimetil-O-(3-metil-4-metiltio-fenil)-monotiofosfato
  • O,O-Dimethyl O-3-methyl-4-methylthiophenyl phosphorothioate
  • O,O-Dimethyl-O-(3-methyl-4-methylthio-fenyl)-monothiofosfaat
  • o,o-dimethyl o-(3-methyl-4-(methylthio)phenyl) phosphorothioate
  • O,O-Dimethyl-O-(3-methyl-4-methylmercaptophenyl)phosphorothioate

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Appearance
Colorless liquidexp.
Odour
Slight garlic odorexp.
Melting point
7 °Cexp.
Boiling point
87 °Cexp.
Density
Relative density (water = 1): 1.25exp.
Flash point
170 °Cexp.
Autoignition temperature
365 °Cexp.
Solubility
Solubility (20 °C): 2 mg/kg water, >1 kg/kg dichloromethane, propan-2-ol.exp.
Vapour pressure
4 mPa at 20 °C, 10 mPa at 30 °Cexp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
278.34 g/molcalc.
Exact mass
278.02 Dacalc.
LogP (octanol/water)
3.61calc.
Topological polar surface area
27.69 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
5calc.
Rotatable bonds
5calc.
Heavy atoms
16calc.
Rings
1calc.
Aromatic rings
1calc.
Fraction sp3 carbons
0.4calc.
Formal charge
0calc.
Stereocentres
0calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Murcko scaffold

The ring system that remains when every side chain is removed

Murcko scaffold of this chemical, c1ccccc1

c1ccccc1

1 ring, 6 atoms, the Benzene ring system.

485,677 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS06: Acute toxicity (severe)
Acute toxicity (severe)
GHS08: Serious health hazard
Serious health hazard
GHS09: Hazardous to the environment
Hazardous to the environment

Hazard statements

  • H302Harmful if swallowed.
  • H312Harmful in contact with skin.
  • H331Toxic if inhaled.
  • H341Suspected of causing genetic defects.
  • H372Causes damage to organs through prolonged or repeated exposure.
  • H400Very toxic to aquatic life.
  • H410Very toxic to aquatic life with long lasting effects.
Precautionary statements (22)
  • P203Obtain, read and follow all safety instructions before use.
  • P260Do not breathe dust, fume, gas, mist, vapours or spray.
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P270Do not eat, drink or smoke when using this product.
  • P271Use only outdoors or in a well-ventilated area.
  • P273Avoid release to the environment.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P301 + P317If swallowed: Get medical help.
  • P302 + P352If on skin: Wash with plenty of water.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P316Get emergency medical help immediately.
  • P317Get medical help.
  • P318If exposed or concerned, get medical advice.
  • P319Get medical help if you feel unwell.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P391Collect spillage.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 3018
Transport hazard class
6.1
Packing group
III

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Fenthion suppliers

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Where suppliers are based

22 suppliers in 7 countries

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Fenthion price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Use classes: Insecticides, Animal Drugs.

Pharmacological actions

  • Cholinesterase Inhibitors
  • Insecticides

Roles

  • acaricide
  • agrochemical
  • avicide
  • enzyme inhibitor
  • insecticide
  • pesticide

Functional uses

  • Biocide

Pharmacology

Fenthion is a synthetic organophosphate acetylcholinesterase inhibitor that is used as a pesticide. It is characterized as a volatile and persistent colorless or yellow to tan oily liquid with a slight garlic odor, and exposure occurs by inhalation, ingestion, or contact.

How it is made

Condensation of 4-methylmercapto-m-cresol & o,o-dimethyl phosphorochloridothioate

Fenthion may be made by the condensation of 4-methylmercapto-m-cresol and dimethylphosphorochloridothionate.

Regulatory status

Inventories, regulations and trade controls that list this substance

Europe

  • EU harmonised classification (CLP Annex VI)
    Index no: 015-048-00-8

Health and food

  • EU Cosmetics Regulation Annex II, prohibited in cosmetics
    Name: Fenthion (ISO), Ref no: 1072, Annex ref: II/1072

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Fenthion is traded under.

HS 2930.90Indicative HS code

Organo-sulphur compounds, other

World exports in 2024
$5.83B
+0.1% vs 2023, imports $5.93B
2019 to 2024
Top exporters
  1. China40.7%
  2. United States10.9%
  3. Japan9.3%
Top importers
  1. United States13.3%
  2. Brazil12.6%
  3. China6.6%
Reported customs values in USD, not prices.Full trade data

The HS code shown for Fenthion is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Fenthion, based on the data on this page

What is Fenthion?

Fenthion is an organic thiophosphate that is O,O-dimethyl hydrogen phosphorothioate in which the hydrogen atom of the hydroxy group is replaced by a 3-methyl-4-(methylsulfanyl)phenyl group. It exhibits acaricidal and insecticidal activities.

What is the CAS number of Fenthion?

The CAS registry number of Fenthion is 55-38-9.

What is the molecular formula and weight of Fenthion?

The molecular formula of Fenthion is C10H15O3PS2 and its molar mass is 278.34 g/mol.

What is Fenthion used for?

Use classes: Insecticides, Animal Drugs.

Is Fenthion hazardous?

Fenthion carries the GHS signal word "Danger". Main hazards: harmful if swallowed, harmful in contact with skin, toxic if inhaled. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Fenthion?

Fenthion is usually classified under HS code 293090 (Organo-sulphur compounds, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Fenthion?

CompoundList lists 22 suppliers of Fenthion in China, United States, India, Canada and 3 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Fenthion in India?

2 suppliers in India list Fenthion on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Fenthion?

Suppliers quote Fenthion on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Fenthion

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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