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.

结果得到金霉素相色谱图以及相色谱峰应的一级质谱图。谱图进归纳,推测金霉素中含有四环素、差向异构四环素和差向异构金霉素杂质组。