Bis(2-chloroethyl)sulfide

Mustard gas
Names
	Preferred IUPAC name 1-Chloro-2-[(2-chloroethyl)sulfanyl]ethane
	Other names Bis(2-chloroethyl) sulfide; HD ; Iprit; Schwefel-LOST; Lost; Sulfur mustard; Senfgas; Yellow cross liquid; Yperite; Distilled mustard; Mustard T- mixture; 1,1'-thiobis[2-chloroethane]; Dichlorodiethyl sulfide
Identifiers
CAS Number	505-60-2 ;
3D model (JSmol)	Interactive image;
Beilstein Reference	1733595
ChEBI	CHEBI:25434 ;
ChEMBL	ChEMBL455341 ;
ChemSpider	21106142 ;
EC Number	684-527-7;
Gmelin Reference	324535
KEGG	C19164 ;
PubChem CID	10461;
UNII	T8KEC9FH9P ;
	InChI InChI=1S/C4H8Cl2S/c5-1-3-7-4-2-6/h1-4H2 Key: QKSKPIVNLNLAAV-UHFFFAOYSA-N ; InChI=1/C4H8Cl2S/c5-1-3-7-4-2-6/h1-4H2 Key: QKSKPIVNLNLAAV-UHFFFAOYAK;
	SMILES ClCCSCCCl;
Properties
Chemical formula	C4H8Cl2S
Molar mass	159.07 g·mol−1
Appearance	Colorless if pure. Normally ranges from pale yellow to dark brown. Slight garlic or horseradish type odor.
Density	1.27 g/mL, liquid
Melting point	14.4 °C (57.9 °F; 287.5 K)
Boiling point	217 °C (423 °F; 490 K) begins to decompose at 217 °C (423 °F) and boils at 218 °C (424 °F)
Solubility in water	7.6 mg/L at 20°C
Solubility	Alcohols, ethers, hydrocarbons, lipids, THF
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Flammable, toxic, vesicant, carcinogenic, mutagenic
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H300, H310, H315, H319, H330, H335
Precautionary statements	P260, P261, P262, P264, P270, P271, P280, P284, P301+P310, P302+P350, P302+P352, P304+P340, P305+P351+P338, P310, P312, P320, P321, P322, P330, P332+P313, P337+P313, P361, P362, P363, P403+P233, P405, P501
NFPA 704 (fire diamond)	4 1 1
Flash point	105 °C (221 °F; 378 K)
Safety data sheet (SDS)	External MSDS
Related compounds
Related compounds	Nitrogen mustard, Bis(chloroethyl) ether, Chloromethyl methyl sulfide
	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

Bis(2-chloroethyl)sulfide is the organosulfur compound with the formula (ClCH₂CH₂)₂S. It is a prominent member of a family of cytotoxic and blister agents known as mustard agents. Sometimes referred to as mustard gas, the term is technically incorrect: bis(2-chloroethyl)sulfide is a liquid at room temperature. In warfare it was dispersed in the form of a fine mist of liquid droplets.

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