1-Ethyl-1H-pyrazole-4-boronic acid, pinacol ester1-Ethyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole1-Ethyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole1-乙基-4-(4,4,5,5-四甲基-1,3,2-二氧杂戊硼烷-2-基)-1H-吡唑1-Ethyl-1H-pyrazole-4-boronic acid pinacol ester1-乙基-1H-吡唑-4-硼酸频哪醇酯