RESULTS The chlortetracycline's epimer, tetracycline and its epimer, as impurities in chlortetracycline have been determined by the liquid chromatogram and its first order mass spectrum.

结果得素样品液相色谱图以及液相色谱峰应的一级质谱图。谱图进行分析归,素样品中含有四环素、差向异构四环素和差向异构素杂质组分。