71303-91-8 Benzoic acid, 4-benzoyl-1-methyl-4-piperidyl ester Ketone, 4-hydroxy-1-methyl-4-piperidyl phenyl, benzoate (ester), conjugate monoacid Methanone, (4-(benzoyloxy)-1-methyl-4-piperidinyl)phenyl-, conjugate monoacid