羟基嘌呤

4-methylsulfanyl-1,2-dihydropyrazolo[3,4-d]pyrimidin-6-one

5-硫代-2,4,8,9-四氮杂双环[4.3.0]壬-1,6-二烯-3-酮

4,6-二氯-1H-吡唑并[3,4-C]嘧啶

6-氯-1,5-二氢-4H-吡唑并[3,4-d]嘧啶-4-硫酮