3-[3,4-dihydroxy-5-(hydroxymethyl)oxolan-2-yl]-7H-pyrrolo[2,3-d]pyrimidin-4-one

7H-吡咯并[2,3-D]嘧啶

4-氯-7-甲基吡咯并[2,3-D]嘧啶

6-氯-7-碘-7-脱氮嘌呤

5-溴-3,7-二氢-4H-吡咯[2,3-d]嘧啶-4-酮