The present invention relates generally to synthetic pyrimidine derivatives and, more particularly, to the methods of deriving the compounds that are the derivatives of 2,8-dithioxo-1H-pyrano[2,3-d: 6,5-d']dipyrimidine or its 10-aza-analogue. The compounds disclosed in the present invention are shown to possess antiviral activities against, but not limited to, the Herpes virus, the Chlamydia virus, the Influenza virus and HIV. The instant abstract is neither intended to define the invention disclosed in this specification nor intended to limit the scope of the invention in any way.