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.

结果得到金样品液相色图以及液相色峰对应的一级质图。对图进行分析归纳,推测金样品中含有四环、差向异构四环和差向异构金质组分。