8-benzoyl-6-(imidazole-1-carbonyl)-1,4-dioxa-8-aza-spiro[4.5]decane
mono-tert-butyl malonate
ethyl 1-benzoyl-4-oxopiperidine-3-carboxylate
8-benzoyl-1,4-dioxa-8-aza-spiro[4.5]decane-6-carboxylic acid ethyl ester
8-benzoyl-1,4-dioxa-8-aza-spiro[4.5]decane-6-carboxylic acid
8-benzoyl-6-(1-hydroxyimino-ethyl)-1,4-dioxa-8-aza-spiro[4.5]decane
N-(4-methyl-spiro[1,3-diaza-bicyclo[3.3.1]non-2-ene-6,2'-[1,3]dioxolan]-2-yl)-toluene-4-sulfonamide
6-(1-amino-ethyl)-8-benzoyl-1,4-dioxa-8-aza-spiro[4.5]decane
6-acetyl-8-benzoyl-1,4-dioxa-8-aza-spiro[4.5]decane