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.
结果得到样品液相色谱图以及液相色谱峰对应的一级质谱图。对谱图进行分析归纳,推测
样品中含有四环
、差向异构四环
和差向异构
杂质组分。