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.

结果得到金霉素样品色图以色峰应的一图。图进行分析归纳,推测金霉素样品中含有四环素、差向异构四环素和差向异构金霉素杂组分。