6-溴乙基-喋啶-2,4-二胺

γ-tert-butyl α-methyl N-(4-amino-4-deoxy-N10-methylpteroyl)-4-cyanoglutamate

2,3-二溴丙醛

甲氨蝶呤

2,4,5,6-四氨基嘧啶