常见例句雙語例句Screening for 2 - bromo-butyric acid as the starting material, after ammonolysis, esterification, ester amine solution, split, five-step cyclization reaction Levetiracetam.篩選以2-溴代丁酸爲起始原料，經氨解，酯化，酯胺解，拆分，環郃五步反應制得左乙拉西坦。 返回 bromo amine