2,6-dibromo-9-(2-deoxy-3,5-di-p-toluoyl-β-D-ribofuranosyl)purine

2,6-二溴嘌呤

2,6-二巯基嘌呤

1-Alpha-氯-3,5-二-O-对甲苯甲酰基-2-脱氧-D-呋喃核糖

2-溴-6-氨基嘌呤