The molecule is an organofluorine compound that is 5-fluorocytosine substituted at the 1 position by a 2-(hydroxymethyl)-1,3-oxathiolan-5-yl group (2R,5S configuration). It is used in combination therapy for the treatment of HIV-1 infection. It has a role as an antiviral drug and a HIV-1 reverse transcriptase inhibitor. It is a pyrimidone, an organofluorine compound, a monothioacetal and a nucleoside analogue.
4-amino-5-fluoro-1-[(2R,5S)-2-(hydroxymethyl)-1,3-oxathiolan-5-yl]pyrimidin-2-one