101861-29-4
5,6-dimethyl-3-oxo-2,3-dihydro-pyridazine-4-carboxylic acid
→
873397-60-5
6-氯-3,4-二甲基吡嗪
40380-36-7
5,6-二甲基-3-氧代-2H-吡嗪-4-甲腈
100114-19-0
5,6-dimethyl-2H-pyridazin-3-one