8-hydroxyamino-1,3,7-trimethyl-3,7-dihydropurine-2,6-dione

对硝基苯甲腈

1,3,7-三甲基尿酸

1,3,7-trimethyl-8-sulfanylidene-9H-purine-2,6-dione

8-氯-3,7-二氢-1,3,7-三甲基-1H-嘌呤-2,6-二酮