Parathion methyl

Parathion methyl
Names
	IUPAC name O,O-Dimethyl-O-p-nitrophenylphosphorothioate
	Other names Azophos, Methyl parathion, O,O-Dimethyl O-4-nitrophenyl phosphorothioate, O,O-Dimethyl-p-nitrophenylthionophosphate
Identifiers
CAS Number	298-00-0 ;
3D model (JSmol)	Interactive image;
ChemSpider	3987;
ECHA InfoCard	100.005.501
EC Number	015-035-00-7;
PubChem CID	4130;
RTECS number	TG0175000;
UNII	41BCL2O91D ;
UN number	2783
CompTox Dashboard (EPA)	DTXSID1020855 ;
	InChI InChI=1S/C8H10NO5PS/c1-12-15(16,13-2)14-8-5-3-7(4-6-8)9(10)11/h3-6H,1-2H3 Key: RLBIQVVOMOPOHC-UHFFFAOYSA-N; InChI=1/C8H10NO5PS/c1-12-15(16,13-2)14-8-5-3-7(4-6-8)9(10)11/h3-6H,1-2H3 Key: RLBIQVVOMOPOHC-UHFFFAOYAW;
	SMILES COP(=S)(OC)Oc1ccc(cc1)[N+](=O)[O-];
Properties
Chemical formula	(CH3O)2P(S)OC6H4NO2
Molar mass	263.2 g/mol
Appearance	White to tan, crystalline solid or powder
Odor	pungent, garlic-like
Density	1.36 g/mL (20°C)
Melting point	37 °C; 99 °F; 310 K
Boiling point	143 °C; 289 °F; 416 K
Solubility in water	0.006% (25°C)
Vapor pressure	0.00001 mmHg (20°C)
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	reactive with strong oxidizers and water
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	67 mg/kg (rat, dermal); 10-25 mg/kg (male rat, oral); 24 mg/kg (female rat, oral)
	NIOSH (US health exposure limits):
PEL (Permissible)	none
REL (Recommended)	TWA 0.2 mg/m3 [skin]
IDLH (Immediate danger)	N.D.
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Parathion methyl, or methyl parathion, is an organophosphate insecticide, possessing an organothiophosphate group. It is structurally very similar to parathion-ethyl. It is not allowed for sale and import in nearly all countries around the world, while a few allow it under subject to specified conditions only.