6-甲氧基-1,3-二甲基脲嘧啶

1,3-dimethyl-9H-pyrimido[4,5-b]indole-2,4-dione

1,3-dimethyl-6-(β-methylallyl)aminouracil

6-(3-butenylamino)-1,3-dimethyl-5-nitrosouracil