. "Catalysis of the reaction: aryl dialkyl phosphate + H2O = dialkyl phosphate + an aryl alcohol." . . "OPH" . "esterase E4" . "esterase B1" . "aryldialkylphosphatase activity" . "A-esterase activity" . "aryltriphosphatase activity" . "aryltriphosphate dialkylphosphohydrolase activity" . "organophosphate esterase activity" . "organophosphate hydrolase activity" . "organophosphorus acid anhydrase activity" . "organophosphorus hydrolase activity" . "paraoxon esterase activity" . "paraoxon hydrolase activity" . "paraoxonase activity" . "phosphotriesterase activity" . "pirimiphos-methyloxon esterase activity" . . .