1',3'-二氢螺[咪唑烷-4,2'-茚]-2,5-二酮

5-(4-methylphenyl)imidazolidine-2,4-dione

5-环戊基-5-甲基-咪唑烷-2,4-二酮

1,3-diazaspiro[4.6]undecane-2,4-dione

1,3-二氮杂螺[4.7]十二烷-2,4-二酮