(2R,5S)-5-(5-Fluoro-3,4-dihydro-2,4-dioxo-1(2H)-pyrimidinyl)-1,3-oxathiolane-2-carboxylic acid (1R,2S,5R)-5-methyl-2-(1-methylethyl)cyclohexyl ester

(1S,2R,4R)-1-Isopropyl-2,4-dimethylcyclohexyl-emtricitabine Uracil Carboxylate is the uracil impurity of the parent compound Emtricitabine, E525000, which is a reverse transcriptase inhibitor. It is an effective antiviral agent against HIV, HBV, and other viruses replicating in a similar manner. A nucleoside analog structurally related to Lamivudine (L172500).