5-(4-methoxybenzyl)amino-3-methylimidazole-2,4-dione

5-氯-1-甲基-4-硝基咪唑

2-acetylamino-1-methyl-1,5-dihydro-imidazol-4-one

1,5,6,7-四氢-6-甲基嘧啶并[5,4-e]三嗪-5,7-二酮

1,3-二甲基脲