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3-Oxo-1-oxa-8-aza-spiro[4.5]decane-8-carboxylic acid tert-butyl ester954236-44-3100 % similar tert-Butyl 1-oxa-6-azaspiro(2.5)octane-6-carboxylate147804-30-666 % similar tert-Butyl 2-oxo-7-azaspiro[3.5]nonane-7-carboxylate203661-69-264 % similar 1,1-Dimethylethyl 9-oxo-3-azaspiro[5.5]undecane-3-carboxylate873924-08-459 % similar tert-Butyl 4-oxopiperidine-1-carboxylate79099-07-358 % similar tert-Butyl 2-oxo-6-azaspiro[3.4]octane-6-carboxylate203661-71-657 % similar tert-Butyl 4,4-difluoropiperidine-1-carboxylate281652-10-655 % similar 1,1-Dimethylethyl 1-pyrrolidinecarboxylate86953-79-954 % similar 7-Boc-2-oxa-7-azaspiro[3.5]nonane240401-27-854 % similar 1-Boc-4-methyl-piperidin-4-OL406235-30-154 % similar 3-Oxo-azetidine-1-carboxylic acid tert-butyl ester398489-26-453 % similar 1,1-Dimethylethyl 1-piperidinecarboxylate75844-69-853 % similar N-Boc-hexahydro-1H-azepin-4-one188975-88-452 % similar 1-Boc-4-(hydroxymethyl)-4-methyl-piperidine236406-21-652 % similar tert-Butyl 2,7-diazaspiro[3.5]nonane-7-carboxylate896464-16-752 % similar tert-Butyl 2-oxo-1,7-diazaspiro(3.5)nonane-7-carboxylate392331-78-152 % similar 3-Oxopyrrolidine-1-carboxylic acid tert-butyl ester101385-93-751 % similar tert-Butyl 6-oxo-2-azaspiro(3.3)heptane-2-carboxylate1181816-12-551 % similar tert-Butyl 3,9-diazaspiro[5.5]undecane-3-carboxylate173405-78-251 % similar 1-Boc-4-formyl-4-methyl-piperidine189442-92-051 % similar