硫酸

7,9-二氧代-8-氮杂螺[4.5]癸烷-6,10-二甲腈

spiro[cyclopentane-1,9'-(3,7-diaza-bicyclo[3.3.1]nonane)]-2',4',6',8'-tetraone

7,9-dioxo-8-aza-spiro[4.5]decane-6,10-dicarboxylic acid diamide

10-cyano-7,9-dioxo-8-aza-spiro[4.5]decane-6-carboxylic acid ethyl ester