Title: Asulam
CAS Registry Number: 3337-71-1
CAS Name: [(4-Aminophenyl)sulfonyl]carbamic acid methyl ester
Additional Names: N1-methoxycarbonylsulfanilamide; sulfanilylcarbamic acid methyl ester; methyl p-aminobenzenesulfonylcarbamate
Manufacturers' Codes: M & B 9057
Trademarks: Asulox (RP Agr.)
Molecular Formula: C8H10N2O4S
Molecular Weight: 230.24
Percent Composition: C 41.73%, H 4.38%, N 12.17%, O 27.80%, S 13.93%
Literature References: Carbamate herbicide; folic acid biosynthesis inhibitor. Prepn: BE 622214 (1963 to May & Baker). Description of herbicidal properties: H. J. Cottrell, B. J. Heywood, Nature 207, 655 (1965). Persistence in soil: A. E. Smith, A. Walker, Pestic. Sci. 8, 449 (1977). Mode of action: P. Veerasekaran et al., Pestic. Sci. 12, 325, 330 (1981). Field study on sugarcane and torpedograss: M. A. Hossain et al., J. Weed Sci. Tech. 43, 10 (1998); in bracken control: R. J. Pakeman et al., J. Environ. Management 53, 255 (1998). Review of properties and analytical methods: C. H. Brockelsby, D. F. Muggleton, Anal. Methods Pestic. Plant Growth Regul. 7, 497 (1973); A. Guardigli et al., ibid. 13, 197 (1984).
Properties: White crystals, mp 143-144° (dec). Soly: water 0.5%, hydrocarbons <2%, chlorinated hydrocarbons <2%, acetone 34%, methanol 28%. pKa 4.82. LD50 in rats, mice, dogs, rabbits (mg/kg): >5000, >5000, >5000, >2000 orally; in rats (mg/kg): >1200 dermally (Brockelsby).
Melting point: mp 143-144°
pKa: pKa 4.82
Toxicity data: LD50 in rats, mice, dogs, rabbits (mg/kg): >5000, >5000, >5000, >2000 orally; in rats (mg/kg): >1200 dermally (Brockelsby)
Use: Herbicide.
Atenolol Atevirdine Athamantin Atipamezole Atisine

Skeletal formula
Ball-and-stick model
CAS number 3337-71-1 YesY
PubChem 18752
ChemSpider 17707 YesY
KEGG C18350 YesY
Jmol-3D images Image 1
Molecular formula C8H10N2O4S
Molar mass 230.241 g/mol
Density 1.419 g/mL
 YesY (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

Asulam is a herbicide invented by May & Baker Ltd, part of the Rhône-Poulenc Group, and internally called M&B9057[1] and used in horticulture and agriculture. It is used to kill bracken[2][3] and docks[4] also used as an antiviral agent. It is currently marketed, by United Phosphorus Ltd - UPL, as "Asulox" which contains 400 g/L of asulam sodium salt.

Asulam was declared not approved by the "Commission Implementing Regulation (EU) No 1045/2011 of 19 October 2011 concerning the non-approval of the active substance asulam, in accordance with Regulation (EC) No 1107/2009 of the European Parliament and of the Council concerning the placing of plant protection products on the market, and amending Commission Decision 2008/934/EC (