6-氯-3,4-二甲基吡嗪

5,6-dimethyl-2H-pyridazin-3-one

5,6-二甲基-3-氧代-2H-吡嗪-4-甲腈

5,6-dimethyl-3-oxo-2,3-dihydro-pyridazine-4-carboxylic acid

2-甲基乙酰乙酸