7-methyl-1H-pyrido[2,3-d]pyrimidine-2,4-dione

4-methyl-2-phenylpyrimidine

N-trimethylsilylmethanamine

1 - (2,6 - 二甲基吡啶-3 - 基)乙酮

2，6-二甲基烟酸乙酯/2，6-二甲基-3-羧酸甲酯