13745-58-9
2,4-dimethylpyrazole-3-carboxylic acid
→
160886-90-8
2,4-dimethylpyrazole-3-carbonyl chloride
6076-12-6
4-甲基吡唑-3-甲酸乙酯
68809-64-3
1,4-二甲基-1H-吡唑-5-羧酸乙酯