The present invention relates to mononucleoside phosphate compounds that
have the benefits of a dinucleotide pharmaceutical. These mononucleoside
phosphates can be made from a mononucleotide that has been modified by
attaching a degradation resistant substituent on the terminal phosphate
of a polyphosphate mononucleotide. By attaching this degradation
resistant substituent, the stability from degradation matches or exceeds
those of certain dinucleotides.