7,9-二氢-7,9-二甲基-1H-嘌呤-2,6,8(3H)-三酮

3-methyl-2-phenyl-1,3-oxazolidine

2-imino-1,3-dimethylimidazolidin-4-one

乙醇

2-imino-3-ethyl-1-methylimidazolidin-4-one