5'-O-[5-[(Acetyloxy)methyl]-8-methyl-2-oxido-4H-1,3,2-dioxaphosphorino[4,5-c]pyridin-2-yl]-2-amino-2'-C-methyladenosine

(2'R)-5'-O-[5-[(Acetyloxy)methyl]-8-methyl-2-oxido-4H-1,3,2-dioxaphosphorino[4,5-c]pyridin-2-yl]-2-amino-2'-deoxy-2'-fluoro-2'-methyladenosine

(2'R)-5'-O-[5-[(Acetyloxy)methyl]-3,4-dihydro-8-methyl-2-oxido-2H-pyrido[4,3-e]-1,3,2-oxazaphosphorin-2-yl]-2-amino-2'-deoxy-2'-fluoro-2'-methyladenosine

5'-O-[5-[(Acetyloxy)methyl]-3,4-dihydro-8-methyl-2-oxido-2H-pyrido[4,3-e]-1,3,2-oxazaphosphorin-2-yl]-2-amino-2'-C-methyladenosine

(2'R)-5'-O-[9-(Acetyloxy)-4,5-dihydro-8-methyl-3-oxidopyrido[3,4-e][1,3,2]oxazaphosphepin-3(1H)-yl]-2-amino-2'-deoxy-2'-fluoro-2'-methyladenosine

5'-O-[9-(Acetyloxy)-4,5-dihydro-8-methyl-3-oxidopyrido[3,4-e][1,3,2]oxazaphosphepin-3(1H)-yl]-2-amino-2'-C-methyladenosine

(2'R)-5'-O-[9-(Acetyloxy)-1,5-dihydro-8-methyl-3-oxido[1,3,2]dioxaphosphepino[5,6-c]pyridin-3-yl]-2-amino-2'-deoxy-2'-fluoro-2'-methyladenosine

5'-O-[9-(Acetyloxy)-1,5-dihydro-8-methyl-3-oxido[1,3,2]dioxaphosphepino[5,6-c]pyridin-3-yl]-2-amino-2'-C-methyladenosine

(2'R)-2-Amino-2'-deoxy-5'-O-[3,4-dihydro-8-methyl-8-[(2-methyl-1-oxopropoxy)methyl]-2-oxido-2H-pyrido[4,3-e]-1,3,2-oxazaphosphorin-2-yl]-2'-fluoro-2'-methyladenosine

(2'R)-2-Amino-2'-deoxy-5'-O-[4,5-dihydro-8-methyl-3-oxido-9-(1-oxopropoxy)pyrido[3,4-e][1,3,2]oxazaphosphepin-3(1H)-yl]-2'-fluoro-2'-methyladenosine

2-Amino-5'-O-[4,5-dihydro-8-methyl-3-oxido-9-(1-oxopropoxy)pyrido[3,4-e][1,3,2]oxazaphosphepin-3(1H)-yl]-2'-C-methyladenosine

(2'R)-2-Amino-2'-deoxy-5'-O-[1,5-dihydro-8-methyl-3-oxido-9-(1-oxopropoxy)[1,3,2]dioxaphosphepino[5,6-c]pyridin-3-yl]-2'-fluoro-2'-methyladenosine

2-Amino-5'-O-[1,5-dihydro-8-methyl-3-oxido-8-(1-oxopropoxy)[1,3,2]dioxaphosphepino[5,6-c]pyridin-3-yl]-2'-C-methyladenosine

(2'R)-2-Amino-2'-deoxy-5'-O-[4,5-dihydro-8-methyl-9-(2-methyl-1-oxopropoxy)-3-oxidopyrido[3,4-e][1,3,2]oxazaphosphepin-3(1H)-yl]-2'-fluoro-2'-methyladenosine

2-Amino-5'-O-[4,5-dihydro-8-methyl-9-(2-methyl-1-oxopropoxy)-3-oxidopyrido[3,4-e][1,3,2]oxazaphosphepin-3(1H)-yl]-2'-C-methyladenosine

(2'R)-2-Amino-2'-deoxy-5'-O-[1,5-dihydro-8-methyl-9-(2-methyl-1-oxopropoxy)-3-oxido[1,3,2]dioxaphosphepino[5,6-c]pyridin-3-yl]-2'-fluoro-2'-methyladenosine

2-Amino-5'-O-[1,5-dihydro-8-methyl-9-(2-methyl-1-oxopropoxy)-3-oxido[1,3,2]dioxaphosphepino[5,6-c]pyridin-3-yl]-2'-C-methyladenosine

2-Amino-5'-O-(5,9-dihydro-7-oxidopyrido[3,2-e][1,3,2]oxazaphosphepin-7(6H)-yl)-2'-C-methyladenosine

(2'R)-2-Amino-2'-deoxy-5'-O-(5,9-dihydro-7-oxido[1,3,2]dioxaphosphepino[5,6-b]pyridin-7-yl)-2'-fluoro-2'-methyladenosine

2-Amino-5'-O-(5,9-dihydro-7-oxido[1,3,2]dioxaphosphepino[5,6-b]pyridin-7-yl)-2'-C-methyladenosine