英文别名Emtricitabine Impurity 20; Oxathiolan 5FC-alpha; 5-epi Emtricitabine; alpha-L-FTC; alpha-L-Oxathiolanyl-5-fluorocytidine; Emtricitabine 5-Epimer; (2R,5R)-Emtricitabine; alpha-L-(+)-(2R,5R)-5-Fluoro-1-(2-(hydroxymethyl)-1,3-oxathiolan-5-yl)cytosine; Oxathiolan 5FC-.a.; Emtricitabine IP Impurity B