7-benzyl-1-methyl-3,7-dihydro-purine-2,6-dione

6-氨基-1-异丁基-3-甲基-5-亚硝基尿嘧啶

甲酸

4,5-二氨基-3-异丁基-1-甲基嘧啶-2,6-二酮

1-methyl-7-[(pivaloyloxy)methyl]xanthine