1-[(4R,5R,7S,8R)-7-Azido-8-(benzoyloxy)-7-(iodomethyl)-6-oxa-1-thiaspiro[3.4]oct-5-yl]-2,4(1H,3H)-pyrimidinedione

1-[(4R,5R,7S,8R)-7-Azido-8-hydroxy-7-(iodomethyl)-6-oxa-1-thiaspiro[3.4]oct-5-yl]-2,4(1H,3H)-pyrimidinedione

1-[(2S,2′R,4aS,6R,7aR)-2-(Cyclobutylamino)-4a-fluorodihydro-2-oxidospiro[4H-furo[3,2-d]-1,3,2-dioxaphosphorin-7(6H),2′-thietan]-6-yl]-2,4(1H,3H)-pyrimidinedione

1-[(2R,2′R,4aS,6R,7aR)-2-(Cyclobutylamino)-4a-fluorodihydro-2-oxidospiro[4H-furo[3,2-d]-1,3,2-dioxaphosphorin-7(6H),2′-thietan]-6-yl]-2,4(1H,3H)-pyrimidinedione

1-[(2′R,4aS,6R,7aR)-2-(Cyclopentyloxy)-4a-fluorodihydro-2-oxidospiro[4H-furo[3,2-d]-1,3,2-dioxaphosphorin-7(6H),2′-thietan]-6-yl]-2,4(1H,3H)-pyrimidinedione

N-[[[(4R,5R,7S,8R)-5-(4-Amino-2-oxo-1(2H)-pyrimidinyl)-7-fluoro-8-hydroxy-6-oxa-1-thiaspiro[3.4]oct-7-yl]methoxy]phenoxyphosphinyl]-L-alanine 1-methylethyl ester

N-[[[(4R,5R,7S,8R)-5-[4-[[Bis(4-methoxyphenyl)phenylmethyl]amino]-2-oxo-1(2H)-pyrimidinyl]-7-fluoro-8-hydroxy-6-oxa-1-thiaspiro[3.4]oct-7-yl]methoxy]phenoxyphosphinyl]-L-alanine 1-methylethyl ester

4-[[Bis(4-methoxyphenyl)phenylmethyl]amino]-1-[(4R,5R,7S,8R)-7-fluoro-8-hydroxy-7-(hydroxymethyl)-6-oxa-1-thiaspiro[3.4]oct-5-yl]-2(1H)-pyrimidinone

1-[(4R,5R,7S,8R)-8-(Benzoyloxy)-7-[(benzoyloxy)methyl]-7-fluoro-6-oxa-1-thiaspiro[3.4]oct-5-yl]-4-[[bis(4-methoxyphenyl)phenylmethyl]amino]-2(1H)-pyrimidinone

4-Amino-1-[(4R,5R,7S,8R)-7-fluoro-8-hydroxy-7-(hydroxymethyl)-6-oxa-1-thiaspiro[3.4]oct-5-yl]-2(1H)-pyrimidinone

4-Amino-1-[(4R,5R,7S,8R)-8-(benzoyloxy)-7-[(benzoyloxy)methyl]-7-fluoro-6-oxa-1-thiaspiro[3.4]oct-5-yl]-2(1H)-pyrimidinone

N-[[[(4R,5R,7S,8R)-5-(3,4-Dihydro-2,4-dioxo-1(2H)-pyrimidinyl)-7-fluoro-8-hydroxy-6-oxa-1-thiaspiro[3.4]oct-7-yl]methoxy]phenoxyphosphinyl]-L-alanine 1-methylethyl ester

1-[(4R,5R,7S,8R)-7-Fluoro-8-hydroxy-7-(hydroxymethyl)-6-oxa-1-thiaspiro[3.4]oct-5-yl]-2,4(1H,3H)-pyrimidinedione

1-[(4R,5R,7S,8R)-8-(Benzoyloxy)-7-[(benzoyloxy)methyl]-7-fluoro-6-oxa-1-thiaspiro[3.4]oct-5-yl]-2,4(1H,3H)-pyrimidinedione