24153-51-3
diazomethane
+
35234-87-8
dimethyl (E)-2,3-dicyanobut-2-enedioate
→
105020-45-9
methyl 4-cyano-1H-pyrazole-5-carboxylate
105020-37-9
1H-吡唑-3-羧酸,4-氰基-1-甲基-,甲基酯(9CI)
33090-69-6
3-氰基-1H-吡唑-4-羧酸甲酯
70910-18-8
4-Cyan-1-methyl-5-pyrazolcarbonsaeure-methylester