5'-O-(4,4'-dimethoxytrityl)-3'-deoxythymidin-3'-ylsulfamido-[3'(N)->5'(N)]-3'-O-(tert-butyldimethylsilyl)-5'-deoxythymidine

5'-O-(4,4'-dimethoxytrityl)-2',3'-dideoxythymidine-3'-N-phosphoramidofluoridate

tert-butyl 2-(5-((4-(((2S,3S,5R)-2-(hydroxymethyl)-5-(5-methyl-2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)tetrahydrofuran-3-yl)amino)-4-oxobutyl)carbamoyl)pyridin-2-yl)hydrazine-1-carboxylate

tert-butyl 2-(5-((6-(((2S,3S,5R)-2-(hydroxymethyl)-5-(5-methyl-2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)tetrahydrofuran-3-yl)amino)-6-oxohexyl)carbamoyl)pyridin-2-yl)hydrazine-1-carboxylate

tert-butyl 2-(5-((11-(((2S,3S,5R)-2-(hydroxymethyl)-5-(5-methyl-2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)tetrahydrofuran-3-yl)amino)-11-oxoundecyl)carbamoyl)pyridin-2-yl)hydrazine-1-carboxylate