3-bromo-5,6-dimethyl-1H-pyrazin-2-one

2,3-二甲基-5-羟基吡嗪

5,6-dimethyl-1,4-dihydropyrazine-2,3-dione

2-chloro-5,6-dimethylpyrazine 4-oxide

2,3-二甲基吡嗪