car-302,196 car-302,196 car-302,196 (also known as pcmg or just by its code number 302196) is a moderately potent and relatively short lasting anticholinergic deliriant drug, related to the chemical warfare agent 3-quinuclidinyl benzilate (qnb). it was developed under contract to edgewood arsenal during the 1960s as part of the us military chemical weapons program, during research to improve upon the properties of earlier agents such as qnb. car-302,196identifiers iupac name (1-methylpiperidin-4-yl) 2-cyclopentyl-2-hydroxypent-3-ynoate cas number53034-67-6 ypubchem cid198289chemspider171624uniitng83kqw4hcomptox dashboard (epa)dtxsid30967536 chemical and physical dataformulac16h25no3molar mass279.380 g·mol−13d model (jsmol)interactive image smiles cn1ccc(cc1)oc(=o)c(o)(c#cc)c2cccc2 inchi inchi=1s/c16h25no3/c1-3-10-16(19,13-6-4-5-7-13)15(18)20-14-8-11-17(2)12-9-14/h13-14,19h,4-9,11-12h2,1-2h3key:gkcpdyhgdhcijl-uhfffaoysa-n (verify) car-302,196 was found to be only around 1/4 the potency of qnb, but its onset of action was much faster at only a few minutes, and the duration far shorter at only 2–3 hours. a fast-acting and short-lasting anticholinergic drug was felt to be more desirable for some applications.