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tert-Butyl 4,7-diazaspiro(2.5)octane-7-carboxylate886766-28-5100 % similar N-Boc-piperazine57260-71-661 % similar tert-Butyl 2,8-diazaspiro[4.5]decane-2-carboxylate336191-17-459 % similar tert-Butyl 2,6-diazaspiro(3.4)octane-6-carboxylate885270-86-056 % similar 2,7-Diaza-spiro[4.4]nonane-2-carboxylic acid tert-butyl ester236406-49-856 % similar tert-Butyl 1,4-diazepane-1-carboxylate112275-50-055 % similar 2-(tert-Butoxycarbonyl)-2,7-diazaspiro[3.5]nonane236406-55-655 % similar tert-Butyl 6-oxo-2,7-diazaspiro[4.4]nonane-2-carboxylate1194376-44-755 % similar tert-Butyl 3,9-diazaspiro[5.5]undecane-3-carboxylate173405-78-254 % similar 1-Boc-3-oxopiperazine76003-29-754 % similar 1,1-Dimethylethyl 1-pyrrolidinecarboxylate86953-79-953 % similar 5-Oxo-(1,4)diazepane-1-carboxylic acid tert-butyl ester190900-21-152 % similar tert-Butyl 2-oxo-6-azaspiro[3.4]octane-6-carboxylate203661-71-652 % similar tert-Butyl 2,6-diazaspiro[3.4]octane-2-carboxylate885270-84-852 % similar N-(tert-Butoxycarbonyl)-2,5-dihydro-1H-pyrrole73286-70-151 % similar 1,1-Dimethylethyl 1-piperidinecarboxylate75844-69-851 % similar tert-Butyl 2,7-diazaspiro[3.5]nonane-7-carboxylate896464-16-751 % similar 1,1-Dimethylethyl 3-hydroxy-3-methyl-1-piperidinecarboxylate1104083-27-351 % similar tert-Butyl 3-methylpiperazine-1-carboxylate120737-59-951 % similar tert-Butyl 2-oxa-6-azaspiro[3.5]nonane-6-carboxylate1245816-29-851 % similar