The main impurity involved in the synthesis of erythromycin oxime was separated and purified, which was identified as the very compound formed in the acidic hydrolysis of erythromycin A, i.e erythromycin A 8,9 dehydro 6,9 hemiketal.

• 分离和鉴定了在合成红霉素肟的过程中产生的一种主要杂质 ；通过 IR；UV；MS；1 H NMR和 1 3C NMR确证它和红霉素在酸性水解时生成的红霉素 A 8；9-脱水 - 6；9-半缩酮为同一化合物 .