N4-benzoyl-1-[2'-O-benzoyl-3'-O-((2-cyanoethoxy)(diisopropylamino)phosphino)-4'-O-((4'',4'''-dimethoxytriphenyl)methyl)-α-lyxopyranosyl-(1')]cytosine 、 9-[2'-O-benzoyl-3'-O-((2-cyanoethoxy)(diisopropylamino)phosphino)-4'-O-((4'',4'''-dimethoxytriphenyl)methyl)-α-lyxopyranosyl-(1')]-N
2-isobutyrylguanine 以18%的产率得到(L)-α-lyxopyranosyl-(4'->3')-(GC)3