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Lewisite 2

Also known as Arsinous chloride, bis(2-chloroethenyl)-, Arsine, chlorobis(2-chlorovinyl)-, Arsinous chloride, as,as-bis(2-chloroethenyl)-

CAS 40334-69-8Formula C4H4AsCl3Molar mass 233.36 g/mol
Lewisite 2 chemical structure, C4H4AsCl3, CAS 40334-69-8
2D chemical structure

Key facts

What buyers check first

CAS number
40334-69-8
Formula
C4H4AsCl3
Molar mass
233.36 g/mol
HS code
293190
Category
Halogenated compounds

What is Lewisite 2?

Plain description, key identifiers and synonyms

This material is a chemical weapon or chemical weapon impurity that is similar to the chemical weapon lewisite. See the chemical datasheet for lewisite for more information.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
chloro-bis[(E)-2-chloroethenyl]arsane
CAS number
40334-69-8 CAS number cross-checkedOther or deprecated CAS: 50361-06-3
Molecular formula
C4H4AsCl3
UNII
80474J4P87
InChIKey
YRFJGLQNTWLXKO-ZPUQHVIOSA-N
InChI
InChI=1S/C4H4AsCl3/c6-3-1-5(8)2-4-7/h1-4H/b3-1+,4-2+
Canonical SMILES
ClC=C[As](Cl)C=CCl
Isomeric SMILES
C(=C/[As](Cl)/C=C/Cl)\Cl

Synonyms

  • Arsinous chloride, bis(2-chloroethenyl)-
  • Arsine, chlorobis(2-chlorovinyl)-
  • Arsinous chloride, as,as-bis(2-chloroethenyl)-
  • Lewisite II
  • Bis(2-chlorovinyl)chloroarsine
  • Dichlorovinylarsine chloride
  • Lewisite 2, (E,E)-
  • Chlorobis(trans-2-chlorovinyl)arsine
  • Arsine, bis(2-chlorovinyl)chloro-
  • Arsinous chloride, bis((1E)-2-chloroethenyl)-
  • Arsinous chloride, bis(2-chloroethenyl)-, (E,E)-
  • Arsinous chloride, as,as-bis((1E)-2-chloroethenyl)-
  • Lewisite (L-2)
  • (E,E)-lewisite 2
  • Dichlorovinylchloroarsine
  • Bis[(E)-2-chloroethenyl]arsinous chloride
  • Bis[(E)-2-chloroethenyl]arsinous chloride #
  • As,As-Bis[(1E)-2-chloroethenyl]arsinous chloride

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

No measured properties are recorded for this substance yet. Ask suppliers for a technical data sheet.

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
233.36 g/molcalc.
Exact mass
231.8595 Dacalc.
LogP (octanol/water)
2.8calc.
Topological polar surface area
0 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
0calc.
Rotatable bonds
2calc.
Heavy atoms
8calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0calc.
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

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.

Lewisite 2 suppliers

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Lewisite 2 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

Regulatory status

Inventories, regulations and trade controls that list this substance

No regulatory list memberships are recorded for this substance yet. Always check the rules of the importing and exporting country before trade.

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Lewisite 2 is traded under.

HS 2931.90Indicative HS code

Organo-inorganic compounds, other than tetramethyl lead, tetraethyl lead, tributyltin compounds…

World exports in 2024
$3.97B
+5.3% vs 2023, imports $3.93B
2019 to 2024
Top exporters
  1. China28.3%
  2. United States15.6%
  3. Germany15.1%
Top importers
  1. United States14.6%
  2. China13.0%
  3. South Korea8.5%
Reported customs values in USD, not prices.Full trade data

The HS code shown for Lewisite 2 is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Lewisite 2, based on the data on this page

What is Lewisite 2?

This material is a chemical weapon or chemical weapon impurity that is similar to the chemical weapon lewisite. See the chemical datasheet for lewisite for more information.

What is the CAS number of Lewisite 2?

The CAS registry number of Lewisite 2 is 40334-69-8. Other or deprecated CAS numbers: 50361-06-3.

What is the molecular formula and weight of Lewisite 2?

The molecular formula of Lewisite 2 is C4H4AsCl3 and its molar mass is 233.36 g/mol.

What is Lewisite 2 used for?

Known uses and roles of Lewisite 2 include building blocks in research and laboratory.

Is Lewisite 2 hazardous?

No GHS hazard classification for Lewisite 2 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 Lewisite 2?

Lewisite 2 is usually classified under HS code 293190 (X. ORGANO-INORGANIC COMPOUNDS, HETEROCYCLIC COMPOUNDS, NUCLEIC ACIDS AND THEIR SALTS…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Lewisite 2?

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What is the price of Lewisite 2?

Suppliers quote Lewisite 2 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 Lewisite 2

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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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