4'-(2-呋喃基)-[4,5'-联嘧啶]-2'-胺

6-methylpyrido[2,3-d]pyrimidine-2,4-diamine

(2-氨基-6-氧代-1,6-二氢-嘧啶-5-基)-乙酸

5-[(1-methylindol-3-yl)methyl]pyrimidine-2,4-diamine

2-氨基-5-苄基-4-羟基嘧啶