Lewisite

Lewisite
Names
	Preferred IUPAC name [(E)-2-Chloroethen-1-yl]arsonous dichloride
	Other names Chlorovinylarsine dichloride; 2-Chloroethenyldichloroarsine; (E)-2-Chlorovinylarsonous dichloride; (E)-2-Chlorovinyldichloroarsine; Dichloro((E)-2-chlorovinyl)arsine
Identifiers
CAS Number	541-25-3 ;
3D model (JSmol)	Interactive image;
ChemSpider	4522971 ;
MeSH	lewisite
PubChem CID	5372798;
UNII	82TOY8U2KD ;
UN number	2810
CompTox Dashboard (EPA)	DTXSID301259287 ;
	InChI InChI=1S/C2H2AsCl3/c4-2-1-3(5)6/h1-2H/b2-1+ Key: GIKLTQKNOXNBNY-OWOJBTEDSA-N ; InChI=1/C2H2AsCl3/c4-2-1-3(5)6/h1-2H/b2-1+ Key: GIKLTQKNOXNBNY-OWOJBTEDBF;
	SMILES Cl[As](Cl)\C=C\Cl;
Properties
Chemical formula	C2H2AsCl3
Molar mass	207.32 g/mol
Density	1.89 g/cm3
Melting point	−18 °C (0 °F; 255 K)
Boiling point	190 °C (374 °F; 463 K)
Solubility in water	Reacts with water
Solubility	Ethers, hydrocarbons, THF
Vapor pressure	0.58 mmHg (25 °C)
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Flammable, highly toxic, corrosive, vesicant
NFPA 704 (fire diamond)	4 1 1
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Lewisite (L) (A-243) is an organoarsenic compound. It was once manufactured in the United States, Japan, Germany and the Soviet Union for use as a chemical weapon, acting as a vesicant (blister agent) and lung irritant. Although the substance is colorless and odorless in its pure form, impure samples of lewisite are a yellow, brown, violet-black, green, or amber oily liquid with a distinctive odor that has been described as similar to geraniums.

Lewisite is named after the US chemist and soldier Winford Lee Lewis (1878–1943). Lewisite finds no other applications; a chemist from the United States Army's chemical warfare laboratories said that "no one has ever found any use for the compound".