英文别名2,7-Diaza-spiro[4.4]nonane-2,9-dicarboxylic acid 2-tert-butyl ester 9-ethyl ester; 2,7-Diazaspiro[4.4]nonane-2,9-dicarboxylic acid, 2-(1,1-dimethylethyl) 9-ethyl ester; Ethyl 7-Boc-2,7-diazaspiro[4.4]nonane-4-carboxylate; 9-Ethyl-(2-boc)-2,7-diazaspiro[4.4]nonane-9-carboxylate; 7-(tert-butoxycarbonyl)-4-ethyl-2,7-diazaspiro[4.4]nonane-4-carboxylic acid; 2-O-tert-butyl 9-O-ethyl 2,7-diazaspiro[4.4]nonane-2,9-dicarboxylate 
