8-chloro-3,7-dimethyl-3,7-dihydro-purine-2,6-dione

8-methoxy-3,7-dimethyl-3,7-dihydro-purine-2,6-dione

重氮甲烷

7,9-二氢-3,7,9-三甲基-1H-嘌呤-2,6,8(3H)-三酮

硫酸二甲酯