4,4'-(pyrimidine-2,4-diyl)dianiline
6-((2-iminopyrrolidin-1-yl)methyl)pyrimidine-2,4(1h,3h)-dione
5-((4-methoxyphenyl)amino)pyrimidine-2,4(1h,3h)-dione
purine and pyrimidine nitrogenous bases - structural chemical
4-hydroxy-2-(phenylamino)pyrimidine-5-carboxylic acid