1-Methyl-4-piperidyl 4-butylaminobenzoate methanesulfonate 100333-38-8 4-Butylaminobenzoic acid 1-methyl-4-piperidyl ester methanesulfonate BENZOIC ACID, p-BUTYLAMINO-, 1-METHYL-4-PIPERIDYL ESTER, METHANESULFONATE Paridocaine methanesulfonate