1,2-Benzenediol, 4-(3-piperidinyl)-, diacetate (ester), ethanedioate (1:1) 3-(3',4'-Diacetoxyphenyl)piperidine oxalate 4-(3-Piperidinyl)-1,2-benzenediol diacetate (ester) ethanedioate (1:1) 61832-54-0