A phosphorsulfide of a deoxynucleoside or {HEAD ~ deoxynucleotide} of {TAIL ~ general formula} : ##STR107## wherein R1 is a hydroxy protecting group; R2 is a phosphate protecting group; R3 is an aryl group; B1 and B2 may be the same or different and each are a base residue which may have a protecting group; and n is zero or an integer, provided that when n is 2 or larger, the respective B2 may be the same or different 
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A phosphorsulfide of a deoxynucleoside or { HEAD ~ deoxynucleotide } of { TAIL ~ general formula } : # # STR107 # # wherein R1 is a hydroxy protecting group ; R2 is a phosphate protecting group ; R3 is an aryl group ; B1 and B2 may be the same or different and each are a base residue which may have a protecting group ; and n is zero or an integer , provided that when n is 2 or larger , the respective B2 may be the same or different
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH