674788-53-5
1-ethyl-4H-pyrazolo[4,3-d]pyrimidin-7-one
→
~97%
923282-50-2
7-氯-1-乙基-1H-吡唑并[4,3-d]嘧啶
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