Tenofovir disoproxil fumarate; 富马酸替诺福韦酯;202138-50-9 Formula:C19H30N5O10P.C4H4O4 Tenofovir Disoproxil Fumarate (Tenofovir DF,GS-1278 Disoproxil Fumarate) belongs to a class of antiretroviral drugs, it inhibits the activity of HIV reverse transcriptase by competing with the natural substrate deoxyadenosine 5’-triphosphate and, after incorporation into DNA, by DNA chain termination.