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Sulfur and phosphorus compounds

Tabun

Also known as Taboon A, Gelan I, Trilon 83

CAS 77-81-6Formula C5H11N2O2PMolar mass 162.13 g/mol
Prohibited, not for trade
Why it is not for trade
Tabun chemical structure, C5H11N2O2P, CAS 77-81-6
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Liquid
Melting point
-50 °C
Boiling point
240 °C
Density
1.073 g/mL at 25 °C
Flash point
77.8 °C
HS code
293149
Category
Sulfur and phosphorus compounds

What is Tabun?

Plain description, key identifiers and synonyms

G-Series Nerve Agent GA is an alkylphosphonic acid ester nerve agent that is a colorless or amber liquid with a bitter almond-like fruity odor and is absorbed into the body by inhalation, ingestion, skin contact, or eye contact. GA causes excessive cholinergic stimulation by inhibiting acetylcholinesterase at neuromuscular junctions and in the central nervous system.

Tabun is a nerve agent.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
[dimethylamino(ethoxy)phosphoryl]formonitrile
CAS number
77-81-6 CAS number cross-checked
Molecular formula
C5H11N2O2P
UNII
S45M750QSH
InChIKey
PJVJTCIRVMBVIA-UHFFFAOYSA-N
InChI
InChI=1S/C5H11N2O2P/c1-4-9-10(8,5-6)7(2)3/h4H2,1-3H3
SMILES (canonical and isomeric)
CCOP(=O)(C#N)N(C)C

Synonyms

  • Taboon A
  • Gelan I
  • Trilon 83
  • Ethyl dimethylphosphoramidocyanidate
  • Ethyl N,N-dimethylphosphoramidocyanidate
  • Dimethylamidoethoxyphosphoryl cyanide
  • Ethyl dimethylamidocyanophosphate
  • GA (chemical warfare agent)
  • Le-100
  • Ethyl phosphorodimethylamidocyanidate
  • Ethyl N-dimethylphosphoramidocyanidate
  • Dimethylphosphoramidocyanidic acid, ethyl ester
  • EA 1205
  • TL 1578
  • Ethyl dimethylphosphoramido cyanidate
  • Dimethylaminocyanphosphorsaeureaethylester
  • N,N-dimethylamido-O-ethyl cyanophosphate
  • Phosphoramidocyanidic acid, dimethyl-, ethyl ester
  • O-Ethyl N,N-dimethylphosphoramidocyanidate
  • Ethylester-dimethylamid kyseliny kyanfosfonove
  • GA [Chemical Warfare Agent]
  • g-Series nerve agent ga
  • [dimethylamino(ethoxy)phosphoryl]formonitrile
  • O-Ethyl N,N-dimethyl phosphoramidocyanidate
  • Phosphoramidocyanidic acid, N,N-dimethyl-, ethyl ester
Show all 29 synonyms
  • (+/-)-TABUN
  • Ethyl dimethylamidocyanidophosphate #
  • Ethyl N,N-dimethylamino cyanophosphate
  • N,N-Dimethylphosphoramidocyanidic acid ethyl ester

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
Liquidexp.
Odour
The industrial product has a weak sweetish smell, in small concentrations, it smells of fruit, but in large concentrations, it smells of fishexp.
Melting point
-50 °Cexp.
Boiling point
240 °Cexp.
Density
1.073 g/mL at 25 °Cexp.
Flash point
77.8 °Cexp.
Solubility
Readily soluble in organic solvents.exp.
Vapour pressure
0.07 mm Hg at 25 °C, 0.037 mm Hg at 20 °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
162.13 g/molcalc.
Exact mass
162.0558 Dacalc.
LogP (octanol/water)
1.26calc.
Topological polar surface area
53.33 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
3calc.
Rotatable bonds
3calc.
Heavy atoms
10calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0.8calc.
Formal charge
0calc.
Stereocentres
1calc.
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

No GHS hazard classification is recorded for this substance yet. That does not mean it is harmless.

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

Tabun suppliers

Trading restrictions apply to this substance

Chemical Weapons Convention Schedule 1

Tabun is prohibited on CompoundList. Listings, quotes and messages are disabled. This page is kept for information only.

Listing and enquiries are not allowed for this substance.

Reference: OPCW Chemical Weapons Convention Schedule 1

Our policy on controlled substances

Tabun price

Indicative price range per kg from live supplier offers

Prices are not shown for prohibited substances.

Uses and applications

What the substance is used for, by industry and function

Chemical warfare agent.

Tabun (military designation GA) is one of the nerve agents, which are the most toxic of the known chemical warfare agents. It has a fruity odor reminiscent of bitter almonds. Exposure to tabun can cause death in minutes. A fraction of an ounce (1 to 10 mL) of tabun on the skin can be fatal. Nerve agents are chemically similar to organophosphate pesticides and exert their effects by interfering with the normal function of the nervous system.

Pharmacological actions

  • Chemical Warfare Agents
  • Cholinesterase Inhibitors

How it is made

Prepared from dimethylamidophosphoryl dichloride and sodium cyanide in presence of ethanol.

Regulatory status

Inventories, regulations and trade controls that list this substance

Chemical Weapons Convention Schedule 1

Tabun is prohibited on CompoundList. Listings, quotes and messages are disabled. This page is kept for information only.

Listing and enquiries are not allowed for this substance.

Reference: OPCW Chemical Weapons Convention Schedule 1

Our policy on controlled substances

Controls

  • Chemical Weapons Convention Schedule 1

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

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

HS 2931.49Indicative HS code

Non-halogenated organo-phosphorous derivatives, other

World exports in 2024
$3.44B
−6.5% vs 2023, imports $3.07B
2022 to 2024
Top exporters
  1. China54.9%
  2. United States25.4%
  3. Germany5.1%
Top importers
  1. United States20.9%
  2. Argentina14.9%
  3. Brazil14.3%
Reported customs values in USD, not prices.Full trade data

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

Frequently asked questions

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

What is Tabun?

G-Series Nerve Agent GA is an alkylphosphonic acid ester nerve agent that is a colorless or amber liquid with a bitter almond-like fruity odor and is absorbed into the body by inhalation, ingestion, skin contact, or eye contact.

What is the CAS number of Tabun?

The CAS registry number of Tabun is 77-81-6.

What is the molecular formula and weight of Tabun?

The molecular formula of Tabun is C5H11N2O2P and its molar mass is 162.13 g/mol.

What is Tabun used for?

Chemical warfare agent. Tabun (military designation GA) is one of the nerve agents, which are the most toxic of the known chemical warfare agents. It has a fruity odor reminiscent of bitter almonds. Exposure to tabun can cause death in minutes. A fraction of an ounce (1 to 10 mL) of tabun on the skin can be fatal.

Is Tabun hazardous?

No GHS hazard classification for Tabun is recorded on CompoundList yet. That does not prove it is safe. Always read the supplier safety data sheet.

What is the HS code of Tabun?

Tabun is usually classified under HS code 293149 (Non-halogenated organo-phosphorous derivatives, other). This is indicative, confirm it with your customs broker before shipping.

Can I buy Tabun on CompoundList?

No. Tabun is on our prohibited list, so listings, quotes and messages for it are disabled. This page is kept for information only.

Guides for buyers

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

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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