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