ql (chemical) ql (chemical) isopropyl aminoethylmethyl phosphonite (nato designation ql), also known as o-(2-diisopropylaminoethyl) o′-ethyl methylphosphonite, is a precursor chemical to the nerve agent vx and vr-56. it is a colorless liquid with a strong fishy odor, and is slightly soluble in water. ql names preferred iupac name 2-ethyl ethyl methylphosphonite other names 2-(diisopropylamino)ethyl ethyl methylphosphoniten--n-isopropyl-propan-2-amineisopropyl aminoethylmethyl phosphoniteo-(2-diisopropylaminoethyl) o'-ethyl methylphosphonite identifiers cas number 57856-11-8 n 3d model (jsmol) interactive image abbreviations ql chemspider 148925 y pubchem cid 170325 unii 8154m6x68l comptox dashboard (epa) dtxsid70866655 inchi inchi=1s/c11h26no2p/c1-7-13-15(6)14-9-8-12(10(2)3)11(4)5/h10-11h,7-9h2,1-6h3 ykey: oiqvkkobtvzife-uhfffaoysa-n yinchi=1/c11h26no2p/c1-7-13-15(6)14-9-8-12(10(2)3)11(4)5/h10-11h,7-9h2,1-6h3key: oiqvkkobtvzife-uhfffaoyan smiles o(p(occn(c(c)c)c(c)c)c)cc properties chemical formula c11h26no2p molar mass 235.308 g·mol−1 appearance colorless liquid odor strong fishy odor boiling point 230 °c (446 °f; 503 k) solubility in water slightly soluble in water except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). n verify (what is yn ?) infobox references synthesis ql is manufactured by reacting diethyl methylphosphonite with 2-(diisopropylamino)ethanol. uses in chemical warfare ql is a component in binary chemical weapons, mainly vx nerve agent. it, along with methylphosphonyl difluoride (df), was developed during the 1980s in order to replace an aging stockpile of unitary chemical weapons. ql is listed as a schedule 1 chemical by the chemical weapons convention. toxicity ql itself is a relatively non-toxic chemical. however, when reacting with sulfur, the corresponding sulfide of ql isomerizes into the highly toxic vx molecule.