116705-37-4
→
~86%
112500-71-7
1,3-dimethylpyrido[4,3-d]pyrimidine-2,4-dione
23941-84-6
1,3,6-三甲基-2,4-二氧代-1,2,3,4-四氢嘧啶-5-甲醛