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Rodenticides, nematicides and other pesticides

Terbufos

Also known as Counter, Contraven, Counter 15G soil insecticide

CAS 13071-79-9Formula C9H21O2PS3Molar mass 288.44 g/molEC 235-963-8
GHS signal word: Danger. Pictograms: Acute toxicity (severe), Hazardous to the environment Controlled, licensed buyers only
Request as a licensed buyer Safety data
Terbufos chemical structure, C9H21O2PS3, CAS 13071-79-9
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Slightly yellowish liquid
Melting point
-29 °C
Boiling point
68.9 °C
Density
1.105 g/cm³ @ 24 °C
Flash point
88 °C
HS code
293090
Category
Rodenticides, nematicides and other pesticides
UN number
UN 2783

What is Terbufos?

Plain description, key identifiers and synonyms

Terbufos is an organothiophosphate insecticide, an organosulfur compound and an organic thiophosphate. It has a role as a nematicide, an agrochemical and an EC 3.1.1.7 (acetylcholinesterase) inhibitor.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
tert-butylsulfanylmethylsulfanyl-diethoxy-sulfanylidene-λ5-phosphane
CAS number
13071-79-9 CAS number cross-checked
EC number
235-963-8
Molecular formula
C9H21O2PS3
UNII
M83BN0F8R9
MDL number
MFCD00055355
InChIKey
XLNZEKHULJKQBA-UHFFFAOYSA-N
InChI
InChI=1S/C9H21O2PS3/c1-6-10-12(13,11-7-2)15-8-14-9(3,4)5/h6-8H2,1-5H3
SMILES (canonical and isomeric)
CCOP(=S)(OCC)SCSC(C)(C)C

Synonyms

  • Counter
  • Contraven
  • Counter 15G soil insecticide
  • AC 92100
  • St-100
  • Counter 15G
  • Phosphorodithioic acid S-((tert-butylthio)methyl) O,O-diethyl ester
  • S-tert-Butylthiomethyl O,O-diethyl phosphorodithioate
  • S-(((1,1-Dimethylethyl)thio)methyl) O,O-diethyl phosphorodithioate
  • S-(((1,1-Dimethylethyl)thio)methyl)-O,O-diethyl phosphorodithioate
  • Phosphorodithioic acid, S-[[(1,1-dimethylethyl)thio]methyl] O,O-diethyl ester
  • S-((tert-Butylthio)methyl)O,O-diethylphosphorodithioate
  • Phosphorodithioic acid S-(((1,1-dimethylethyl)thio)methyl) O,O-diethyl ester
  • S-[(tert-butylsulfanyl)methyl] O,O-diethyl phosphorodithioate
  • Phosphorodithioic acid, S-(((1,1-dimethylethyl)thio)methyl) O,O-diethyl ester
  • tert-butylsulfanylmethylsulfanyl-diethoxy-sulfanylidene-lambda5-phosphane
  • S-((tert-butylsulfanyl)methyl) O,O-diethyl phosphorodithioate
  • O,O-diethyl S((tert-butylthio)methyl)phosphorodithioate
  • ENT 27920
  • Counter 15G soil insecticide-nematicide
  • Phosphorodithioic acid, O,O-diethyl S-(((1,1-dimethylethyl)thio)methyl) ester
  • Aragran
  • S-t-Butylthio-methyl-O,O-diethyl phosphorodithioate
  • Phosphorodithioic acid, S-[(tert-butylthio)methyl] O,O-diethyl ester
  • O,O-Diethyl S-(Tert-butylthio)methyl phosphorodithioate
Show all 34 synonyms
  • S-[(tert-Butylsulfanyl)methyl] o,o-diethyl dithiophosphate
  • Cyanater
  • S-tert-Butylthiomethyl O,O-diethylphosphorodithioate
  • 4-01-00-03092 (Beilstein Handbook Reference)
  • S-[(tert-butylthio)methyl] O,O-diethyl dithiophosphate
  • Terbufos 10 microg/mL in Cyclohexane
  • Terbufos 1000 microg/mL in Acetone
  • Terbufos 10 microg/mL in Acetonitrile
  • Terbufos 100 microg/mL in Acetonitrile

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
Slightly yellowish liquidexp.
Odour
Mercaptan-like odorexp.
Melting point
-29 °Cexp.
Boiling point
68.9 °Cexp.
Density
1.105 g/cm³ @ 24 °Cexp.
Flash point
88 °Cexp.
Solubility
In water, 5.07 mg/l @ 25 °Cexp.
Vapour pressure
0.00032 mm Hg @ 20-25 °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
288.44 g/molcalc.
Exact mass
288.0441 Dacalc.
LogP (octanol/water)
4.51calc.
Topological polar surface area
18.46 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
5calc.
Rotatable bonds
7calc.
Heavy atoms
15calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
1calc.
Formal charge
0calc.
Stereocentres
0calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

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

Hazard statements

  • H300Fatal if swallowed.
  • H310Fatal in contact with skin.
  • H400Very toxic to aquatic life.
  • H410Very toxic to aquatic life with long lasting effects.
Precautionary statements (14)
  • P262Do not get in eyes, on skin, or on clothing.
  • P264Wash skin thoroughly after handling.
  • P270Do not eat, drink or smoke when using this product.
  • P273Avoid release to the environment.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P301 + P316If swallowed: Get emergency medical help immediately.
  • P302 + P352If on skin: Wash with plenty of water.
  • P316Get emergency medical help immediately.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • P361 + P364Take off immediately all contaminated clothing. And wash it before reuse.
  • P391Collect spillage.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 2783
Transport hazard class
6.1
Packing group
I

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

Terbufos suppliers

Controlled substance, listings of documented suppliers only, in the documented ranking

Pesticide toxic

Terbufos is controlled. Only documented suppliers can list it, and buyers must upload a valid licence with their request. Every request is reviewed before suppliers see it.

Terbufos

Reference: Highly hazardous pesticide, WHO class Ia or Ib

Our policy on controlled substances
No documented supplier lists it yet

Licensed buyers can post a request for Terbufos with their licence. Our compliance team reviews it before suppliers see it.

Request as a licensed buyer

Terbufos price

Indicative price range per kg from live supplier offers

No published prices right now

Suppliers quote this chemical on request. Send one free request and compare quotes side by side.

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Uses and applications

What the substance is used for, by industry and function

Soil insecticide.

Control of ... nematodes in beet, maize, cotton, sorghum, onions, cabbage, and bananas.

Effective initial and residual activity against soil dwelling arthropods. Soil application of granules controls Diabrotica species larvae on maize, Tetanops myopaeformis on sugar beet, Delia brassicae on cabbages, millipedes, onion maggots, symphylids, wireworms and other soil dwelling arthropods. Various above ground pests also are controlled on plants grown in terbufos treated soil. It has nematicidal activity.

Terbufos is an organophosphate insecticide/nematicide that is applied... by soil incorporation, during planting, or postemergence to terrestrial food and feed crops. Crops treated are corn, grain, sorghum, and sugar beets. Aerial/broadcast treatment is not registered.

Use classes: Insecticides, Insecticides, Nematicides.

Roles

  • agrochemical
  • enzyme inhibitor
  • nematicide
  • pesticide

Functional uses

  • Biocide

Pharmacology

Terbufos is a synthetic organic thiophosphate compound and organophosphate acetylcholinesterase inhibitor that is used as a pesticide. It is characterized as a colorless to pale yellow liquid with a mercaptan-like odor, and exposure occurs by inhalation, ingestion, or contact.

How it is made

Terbufos is prepared by treating O,O-diethyldithiophosphoric acid with formaldehyde and tert-butanethiol.

Regulatory status

Inventories, regulations and trade controls that list this substance

Pesticide toxic

Terbufos is controlled. Only documented suppliers can list it, and buyers must upload a valid licence with their request. Every request is reviewed before suppliers see it.

Terbufos

Reference: Highly hazardous pesticide, WHO class Ia or Ib

Our policy on controlled substances

Europe

  • EU harmonised classification (CLP Annex VI)
    Index no: 015-139-00-2

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Terbufos 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 Terbufos is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

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

What is Terbufos?

Terbufos is an organothiophosphate insecticide, an organosulfur compound and an organic thiophosphate. It has a role as a nematicide, an agrochemical and an EC 3.1.1.7 (acetylcholinesterase) inhibitor.

What is the CAS number of Terbufos?

The CAS registry number of Terbufos is 13071-79-9.

What is the molecular formula and weight of Terbufos?

The molecular formula of Terbufos is C9H21O2PS3 and its molar mass is 288.44 g/mol.

What is Terbufos used for?

Soil insecticide. Control of ... nematodes in beet, maize, cotton, sorghum, onions, cabbage, and bananas. Effective initial and residual activity against soil dwelling arthropods.

Is Terbufos hazardous?

Terbufos carries the GHS signal word "Danger". Main hazards: fatal if swallowed, fatal in contact with skin, very toxic to aquatic life. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Terbufos?

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

Can I buy Terbufos on CompoundList?

Terbufos is a controlled substance. Only documented suppliers can list it, and buyers must upload a valid licence with their request. Every request is reviewed by our compliance team before suppliers see it.

Guides for buyers

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

Request as a licensed buyer

Upload your licence with the request. Our compliance team reviews it before the documented suppliers see it.
Request as a licensed buyer
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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