6-硫代-7,9-二氢-3H-嘌呤-8-酮

[1,3]噻唑并[5,4-D]嘧啶-7-胺

8-甲基-3,7-二氢嘌呤-6-硫酮

6-methylsulfanylpyrimidine-4,5-diamine

8-(1,3-thiazol-4-yl)-3,7-dihydropurine-6-thione