3-oxaspiro[5.5]undecan-4-one

2,4-dioxo-3-azaspiro[5.5]undecane-5-carbonitrile

硫酸

3-carbamoyl-5-cyano-4-spirocyclohexanepiperidine-2,6-dione

3,7-diazaspiro[bicyclo[3.3.1]nonane-9,1'-cyclohexane]-2,4,6,8-tetraone