75-03-6
碘乙烷
→
50920-45-1
ethyl 1-ethyl-5-methylpyrazole-3-carboxylate
74-96-4
溴乙烷
+
4027-57-0
3-甲基吡唑-5-甲酸乙酯
50920-46-2
1-乙基-5-甲基-1H-吡唑-3-羧酸