Plasma carboxylic-ester hydrolase (EC3.1.1.1) is a very important detoxification route for the toxic stereoisomers of soman. Detoxification is meant in the sense that if soman was bound to carbox-ylic-ester hydrolase, it was not free to inhibit acetylcholinesterase. CBDP (2-(2-Methylphenoxy)-4H-1,3,2-benzodioxaphosphorin 2-oxide) pretreatment, which inhibited irreversibly carboxylic-ester hydrolase activity without inhibiting phosphoryl phosphatase activity, potentiated the toxicity of soman in mice. In toxicity experiments, CBDP (0.5 mg/kg; iv 1 hr prior to soman) pretreatment potentiated the toxicity of C(±)P(±)-, C(+)P(?)-, and C(?)P(?)-soman to a similar degree[1].
[1] John G. Clement. “Stereoisomers of soman (pinacolyl methylphosphonofluoridate): Inhibition of serum carboxylic ester hydrolase and potentiation of their toxicity by CBDP (2-(2-methylphenoxy)-4H-1,3,2-benzodioxaphosphorin-2-oxide) in mice.” Toxicology and applied pharmacology 89 1 (1987): Pages 141-143.
