ethyl 1-tritylpyrazole-4-carboxylate

1-(5-溴-2-吡啶)-1H-吡唑-4-羧酸乙酯

ethyl 1-(4-methylsulfonylphenyl)pyrazole-4-carboxylate

1H-吡唑-4-羧酰胺

Ethyl 1-ethyl-1H-pyrazole-4-carboxylate