1,5-dimethylimidazolidine-2,4-dione

1-甲基-5-硝基-2(1H)-嘧啶酮

3,7-二甲基-2,6,8-三羟基嘌呤

N,N''-dimethylbiuret

3-methyl-2-oxo-1H-imidazole-4-carboxylic acid