4-Hydroxybenzoic acid 4-benzoyl-1-methyl-4-piperidinyl ester conjugate monoacid 71266-45-0 BENZOIC ACID, 4-HYDROXY-, 4-BENZOYL-1-METHYL-4-PIPERIDINYL ESTER, conjugate mono Benzoic acid, 4-hydroxy-, 4-benzoyl-1-methyl-4-piperidinyl ester, conjugate monoacid