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Substance Name: Methidathion [ANSI:BSI:ISO]
RN: 950-37-8
UNII: Y2P145U7KK
InChIKey: MEBQXILRKZHVCX-UHFFFAOYSA-N

Note

  • Widely used on citrus, tobacco, alfalfa, cotton, sorghum & several other crops.

Molecular Formula

  • C6-H11-N2-O4-P-S3

Molecular Weight

  • 302.335
 

Classification Codes

Classification Codes

  • Acaricide
  • Agricultural Chemical
  • Human Data
  • Insecticide
  • Insecticides
  • Mutation Data
  • Pesticides
  • Skin / Eye Irritant

Superlist Classification Code

  • Threshold Planning Quantity (TPQ) = 500/10000 lb
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Names and Synonyms

Results Name

  • Methidathion [ANSI:BSI:ISO]

Name of Substance

  • Methidathion
  • Methidathion [ANSI:BSI:ISO]
  • Supracide

Synonyms

  • (O,O-Dimethyl)-S-(-2-methoxy-delta(sup 2)-1,3,4-thiadiazolin-5-on-4-ylmethyl)dithiophosphate
  • 3-Dimethoxyphosphinothioylthiomethyl-5-methoxy-1,3,4-thiadiazol-2(3H)-one
  • AI3-27193
  • BRN 0619915
  • Caswell No. 378B
  • CCRIS 7085
  • Ciba-Geigy GS 13005
  • Dithiophosphoric acid O,O'-dimethyl-S-((2-methoxy-1,3,4-thiadiazol-5(4H)-on-4-yl)methyl) ester
  • Dithiophosphoric acid O,O'-dimethyl-S-((5-methoxy-1,3,4-thiadiazol-2(3H)-on-3-yl)methyl) ester
  • DMTP (insecticide)
  • EINECS 213-449-4
  • ENT 27193
  • EPA Pesticide Chemical Code 100301
  • Fisons NC 2964
  • Geigy 13005
  • Geigy GS-13005
  • GS 13005
  • HSDB 1594
  • Methidathion
  • Methidathion 50S
  • Metidation
  • Metidation [Polish]
  • O,O'-Dimethyl-S-((2-methoxy-1,3,4-thiadiazole-5(4H)-one-4-yl)methyl) dithiophosphate
  • O,O-Dimethyl S-(2,3-dihydro-5-methoxy-2-oxo-1,3,4-thiadiazol-3-ylmethyl) phosphorodithioate
  • O,O-Dimethyl S-(5-methoxy-1,3,4-thiadiazolinyl-3-methyl)dithiophosphate
  • O,O-Dimethyl-S-((2-methoxy-1,3,4(4H)thiodiazol-5-on-4-yl)-methyl)-dithiofosfaat
  • O,O-Dimethyl-S-((2-methoxy-1,3,4(4H)thiodiazol-5-on-4-yl)-methyl)-dithiofosfaat [Dutch]
  • O,O-Dimethyl-S-(2-methoxy-1,3,4-thiadiazol-5(4H)-onyl-(4)-methyl) dithiophosphat
  • O,O-Dimethyl-S-(2-methoxy-1,3,4-thiadiazol-5(4H)-onyl-(4)-methyl) dithiophosphat [German]
  • O,O-Dimethyl-S-(2-methoxy-1,3,4-thiadiazol-5(4H)-onyl-(4)-methyl) phosphorodithioate
  • O,O-Dimethyl-S-(2-methoxy-1,3,4-thiadiazol-5-on-4-yl)-methyl-dithiophosphat
  • O,O-Dimethyl-S-(2-methoxy-1,3,4-thiadiazol-5-on-4-yl)-methyl-dithiophosphat [German]
  • O,O-Dimetil-S-((2-metossi-1,3,4-(4H)-tiadiazol-5-on-4-il)-metil)-ditiofosfato
  • O,O-Dimetil-S-((2-metossi-1,3,4-(4H)-tiadiazol-5-on-4-il)-metil)-ditiofosfato [Italian]
  • OMS 844
  • Phosphorodithioic acid, O,O-dimethyl ester, S-ester with 4-(mercaptomethyl)-2-methoxy-delta(2)-1,3,4-thiadiazolin-5-one
  • Phosphorodithioic acid, O,O-dimethyl ester, S-ester with 4-(mercaptomethyl)-2-methoxy-delta(sup 2)-1,3,4-thiadiazolin-5-one
  • Phosphorodithioic acid, S-((5-methoxy-2-oxo-1,3,4-thiadiazol-3(2H)-yl)methyl) O,O-dimethyl ester
  • S-((2-Methoxy-5-oxo-1,3,4-thia-diazolin-4-yl)methyl)dimethylphosphorothiolothionate
  • S-((5-Methoxy-2-oxo-1,3,4-thiadiazol-3(2H)-yl)methyl) O,O-dimethyl phosphorodithioate
  • S-(2,3-Dihydro-5-methoxy-2-oxo-1,3,4-thiadiazol-3-methyl) dimethyl phosphorothiolothionate
  • S-(2,3-Dihydro-5-methoxy-2-oxo-1,3,4-thiadiazol-3-methyl)dimethyl phosphorothiolothionate
  • S-2,3-Dihydro-5-methoxy-2-oxo-1,3,4-thiadiazol-3-ylmethyl O,O-dimethyl phosphorodithioate
  • S-2-Metoksy-1,3,4-tiadiazolo-5-on-N-metylo-O,O-dwumetylowy
  • S-2-Metoksy-1,3,4-tiadiazolo-5-on-N-metylo-O,O-dwumetylowy [Polish]
  • Somonil
  • Supracid
  • Supracide
  • Supracide Ulvair
  • Suprathion
  • Ultracid
  • Ultracid 40
  • Ultracid EC 40
  • Ultracide
  • Ultracide Ulvair 250
  • UNII-Y2P145U7KK

Systematic Names

  • Methidathion
  • Phosphorodithioic acid, O,O-dimethyl ester, S-ester with 4-(mercaptomethyl)-2-methoxy-delta(sup 2)-1,3,4-thiadiazolin-5-one
  • Phosphorodithioic acid, S-((5-methoxy-2-oxo-1,3,4-thiadiazol-3(2H)-yl)methyl) O,O-dimethyl ester

Superlist Names

  • Methidathion
  • Phosphorodithioic acid, S-((5-methoxy-2-oxo-1,3,4-thiadiazol-3(2H)-yl)methyl) O,O-dimethyl ester

Registry Numbers

CAS Registry Number

  • 950-37-8

FDA UNII

  • Y2P145U7KK

System Generated Number

  • 0000950378

Structure Descriptors

InChI

1S/C6H11N2O4PS3/c1-10-5-7-8(6(9)16-5)4-15-13(14,11-2)12-3/h4H2,1-3H3

InChIKey

MEBQXILRKZHVCX-UHFFFAOYSA-N

Smiles

P(SCn1c(sc(n1)OC)=O)(OC)(OC)=S

Toxicity

Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
chicken LD50 oral 80mg/kg (80mg/kg)   "Agrochemicals Handbook," with updates, Hartley, D., and H. Kidd, eds., Nottingham, Royal Soc of Chemistry, 1983-86Vol. A268, Pg. 1983,
guinea pig LD50 oral 25mg/kg (25mg/kg)   "Agrochemicals Handbook," with updates, Hartley, D., and H. Kidd, eds., Nottingham, Royal Soc of Chemistry, 1983-86Vol. A268, Pg. 1983,
mammal (species unspecified) LD50 oral 25mg/kg (25mg/kg)   Herba Polonica. Vol. 21, Pg. 53, 1975.
mammal (species unspecified) LD50 unreported 25mg/kg (25mg/kg)   "Chemistry of Pesticides," Melnikov, N.N., New York, Springer-Verlag New York, Inc., 1971Vol. -, Pg. 372, 1971.
man TDLo oral 93mg/kg (93mg/kg) SENSE ORGANS AND SPECIAL SENSES: MIOSIS (PUPILLARY CONSTRICTION): EYE

SENSE ORGANS AND SPECIAL SENSES: LACRIMATION: EYE

BEHAVIORAL: COMA
Human & Experimental Toxicology. Vol. 9, Pg. 415, 1990.
mouse LD50 oral 25mg/kg (25mg/kg)   Bulletin of the Entomological Society of America. Vol. 15, Pg. 122, 1969.
rabbit LD50 oral 63mg/kg (63mg/kg)   "Agrochemicals Handbook," with updates, Hartley, D., and H. Kidd, eds., Nottingham, Royal Soc of Chemistry, 1983-86Vol. A268, Pg. 1983,
rabbit LD50 skin 196mg/kg (196mg/kg)   Ciba-Geigy Toxicology Data/Indexes.
rat LC50 inhalation 50mg/m3/4H (50mg/m3)   Ciba-Geigy Toxicology Data/Indexes.
rat LD50 oral 20mg/kg (20mg/kg)   World Review of Pest Control. Vol. 9, Pg. 119, 1970.
rat LD50 skin 25mg/kg (25mg/kg)   World Review of Pest Control. Vol. 9, Pg. 119, 1970.

Physical Properties

Physical Property Value Units Temp (deg C) Source
Melting Point 39 deg C   EXP
log P (octanol-water) 2.2 (none)   EXP
Water Solubility 187 mg/L 20 EXP
Vapor Pressure 3.37E-06 mm Hg 25 EXP
Henry's Law Constant 7.17E-09 atm-m3/mole 25 EST
Atmospheric OH Rate Constant 1.50E-10 cm3/molecule-sec 25 EST

Physical property data is provided to ChemIDplus by SRC, Inc.