8-benzoyl-1,4-dioxa-8-aza-spiro[4.5]decane-6-carboxylic acid amide
8-benzoyl-1,4-dioxa-8-aza-spiro[4.5]decane-6-carboxylic acid
8-benzoyl-1,4-dioxa-8-aza-spiro[4.5]decane-6-carboxylic acid ethyl ester
8-benzoyl-6-(imidazole-1-carbonyl)-1,4-dioxa-8-aza-spiro[4.5]decane
ethyl 1-benzoyl-4-oxopiperidine-3-carboxylate