9H-Fluoren-9-ylmethyl 6-[4-[(1R,3R,4R,7S)-1-[[bis(4-methoxyphenyl)phenylmethoxy]methyl]-7-[[[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]oxy]-3-(3,4-dihydro-5-methyl-2,4-dioxo-1(2H)-pyrimidinyl)-2-oxa-5-azabicyclo[2.2.1]hept-5-yl]-4-oxobutyl]-13-(9H-fluoren-9-yl)-11-oxo-12-oxa-2,6,10-triazatrid..

9H-Fluoren-9-ylmethyl 6-[3-[(1R,3R,4R,7S)-1-[[bis(4-methoxyphenyl)phenylmethoxy]methyl]-7-[[(R)-[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]oxy]-3-(3,4-dihydro-5-methyl-2,4-dioxo-1(2H)-pyrimidinyl)-2-oxa-5-azabicyclo[2.2.1]hept-5-yl]-3-oxopropyl]-13-(9H-fluoren-9-yl)-11-oxo-12-oxa-2,6,10-triaz..

9H-Fluoren-9-ylmethyl N-[2-[2-[3-[(1R,3R,4R,7S)-1-[[bis(4-methoxyphenyl)phenylmethoxy]methyl]-7-[[(R)-[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]oxy]-3-(3,4-dihydro-5-methyl-2,4-dioxo-1(2H)-pyrimidinyl)-2-oxa-5-azabicyclo[2.2.1]hept-5-yl]-3-oxopropoxy]ethoxy]ethyl]carbamate

9H-Fluoren-9-ylmethyl 6-[4-[(1R,3R,4R,7S)-1-[[bis(4-methoxyphenyl)phenylmethoxy]methyl]-3-(3,4-dihydro-5-methyl-2,4-dioxo-1(2H)-pyrimidinyl)-7-hydroxy-2-oxa-5-azabicyclo[2.2.1]hept-5-yl]-4-oxobutyl]-13-(9H-fluoren-9-yl)-11-oxo-12-oxa-2,6,10-triazatridecanoate

9H-Fluoren-9-ylmethyl 6-[3-[(1R,3R,4R,7S)-1-[[bis(4-methoxyphenyl)phenylmethoxy]methyl]-3-(3,4-dihydro-5-methyl-2,4-dioxo-1(2H)-pyrimidinyl)-7-hydroxy-2-oxa-5-azabicyclo[2.2.1]hept-5-yl]-3-oxopropyl]-13-(9H-fluoren-9-yl)-11-oxo-12-oxa-2,6,10-triazatridecanoate

9H-Fluoren-9-ylmethyl N-[2-[2-[3-[(1R,3R,4R,7S)-1-[[bis(4-methoxyphenyl)phenylmethoxy]methyl]-3-(3,4-dihydro-5-methyl-2,4-dioxo-1(2H)-pyrimidinyl)-7-hydroxy-2-oxa-5-azabicyclo[2.2.1]hept-5-yl]-3-oxopropoxy]ethoxy]ethyl]carbamate

3-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-[[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-2-deoxy-β-D-erythro-pentofuranosyl]-6-(4-methylphenyl)furo[2,3-d]pyrimidin-2(3H)-one

3-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-[[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-2-deoxy-β-D-erythro-pentofuranosyl]-6-(3-methylbutyl)furo[2,3-d]pyrimidin-2(3H)-one

3-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-[[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-2-deoxy-β-D-erythro-pentofuranosyl]-6-decylfuro[2,3-d]pyrimidin-2(3H)-one

3-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-[[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-2-deoxy-β-D-erythro-pentofuranosyl]-6-octylfuro[2,3-d]pyrimidin-2(3H)-one

3-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-[[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-2-deoxy-β-D-erythro-pentofuranosyl]furo[2,3-d]pyrimidin-2(3H)-one

3-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-2-deoxy-β-D-erythro-pentofuranosyl]-6-(4-methylphenyl)furo[2,3-d]pyrimidin-2(3H)-one

3-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-2-deoxy-β-D-erythro-pentofuranosyl]-6-(3-methylbutyl)furo[2,3-d]pyrimidin-2(3H)-one

3-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-2-deoxy-β-D-erythro-pentofuranosyl]-6-decylfuro[2,3-d]pyrimidin-2(3H)-one

3-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-2-deoxy-β-D-erythro-pentofuranosyl]-6-octylfuro[2,3-d]pyrimidin-2(3H)-one

3-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-2-deoxy-β-D-erythro-pentofuranosyl]furo[2,3-d]pyrimidin-2(3H)-one