138786-86-4
4-硝基-1H-吡唑-3-羧酸甲酯
→
923283-58-3
4-氨基-1-乙基-1H-吡唑-3-羧酸甲酯
923283-30-1
methyl 1-ethyl-4-nitro-1H-pyrazole-5-carboxylate