6-羟基甲基嘌呤核糖甙

6-羟基甲基-1,6-二氢嘌呤核糖核苷

6(S)-hydroxymethyl-9-β-D-ribofuranosyl-1,6-dihydropurine

2',3',5'.-tri-O-acetyl-8-bromoguanosine

4,5-二氨基嘧啶