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tert-Butyl 6-oxo-2-azaspiro(3.3)heptane-2-carboxylate1181816-12-5100 % similar tert-Butyl 2-oxo-6-azaspiro[3.4]octane-6-carboxylate203661-71-676 % similar tert-Butyl 7-oxo-2-azaspiro[3.5]nonane-2-carboxylate1363381-22-971 % similar tert-Butyl 2-oxo-7-azaspiro[3.5]nonane-7-carboxylate203661-69-271 % similar 1,1-Dimethylethyl 2,6-diazaspiro[3.3]heptane-2-carboxylate1041026-70-365 % similar 3-Oxo-azetidine-1-carboxylic acid tert-butyl ester398489-26-463 % similar 2-(tert-Butoxycarbonyl)-2,7-diazaspiro[3.5]nonane236406-55-661 % similar tert-Butyl 6-hydroxy-2-azaspiro[3.3]heptane-2-carboxylate1147557-97-859 % similar tert-Butyl 6-amino-2-azaspiro[3.3]heptane-2-carboxylate1211586-09-259 % similar 1,1-Dimethylethyl 3,3-difluoro-1-azetidinecarboxylate1255666-59-159 % similar tert-Butyl 4-oxopiperidine-1-carboxylate79099-07-359 % similar tert-Butyl 2,6-diazaspiro[3.4]octane-2-carboxylate885270-84-858 % similar 1,1-Dimethylethyl 7-oxo-2,6-diazaspiro[3.4]octane-2-carboxylate1234616-51-357 % similar 3-Hydroxy-3-methyl-azetidine-1-carboxylic acid tert-butyl ester1104083-23-957 % similar 3-Oxopyrrolidine-1-carboxylic acid tert-butyl ester101385-93-756 % similar 1,1-Dimethylethyl 9-oxo-3-azaspiro[5.5]undecane-3-carboxylate873924-08-455 % similar tert-Butyl 2,6-Diazaspiro(3.3)heptane-2-carboxylate Hemioxalate1041026-71-455 % similar 1,1-Dimethylethyl 1-pyrrolidinecarboxylate86953-79-955 % similar cis-tert-Butyl 5-oxohexahydrocyclopenta[c]pyrrole-2(1H)-carboxylate146231-54-154 % similar N-Boc-hexahydro-5-oxocyclopenta[C]pyrrole148404-28-854 % similar