{HEAD ~ Phosphorsulfide derivatives} of {TAIL ~ deoxynucleosides} or deoxynucleotides and their uses 
of
{ HEAD ~ Phosphorsulfide derivatives } of { TAIL ~ deoxynucleosides } or deoxynucleotides and their uses
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH