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

1-(2-Deoxy-α-D-erythro-pentofuranosyl)-6-nitro-2,4(1H,3H)-quinazolinedione

7-Chloro-1-(2-deoxy-α-D-erythro-pentofuranosyl)-2,4(1H,3H)-quinazolinedione

6-Chloro-1-(2-deoxy-α-D-erythro-pentofuranosyl)-2,4(1H,3H)-quinazolinedione

5-Chloro-1-(2-deoxy-α-D-erythro-pentofuranosyl)-2,4(1H,3H)-quinazolinedione

1-(2-Deoxy-α-D-erythro-pentofuranosyl)-5-fluoro-2,4(1H,3H)-quinazolinedione

1-[2-Deoxy-3,5-bis-O-(4-methylbenzoyl)-D-erythro-pentofuranosyl]-6-nitro-2,4(1H,3H)-quinazolinedione

7-Chloro-1-[2-deoxy-3,5-bis-O-(4-methylbenzoyl)-D-erythro-pentofuranosyl]-2,4(1H,3H)-quinazolinedione

6-Chloro-1-[2-deoxy-3,5-bis-O-(4-methylbenzoyl)-D-erythro-pentofuranosyl]-2,4(1H,3H)-quinazolinedione

5-Chloro-1-[2-deoxy-3,5-bis-O-(4-methylbenzoyl)-D-erythro-pentofuranosyl]-2,4(1H,3H)-quinazolinedione

1-[2-Deoxy-3,5-bis-O-(4-methylbenzoyl)-D-erythro-pentofuranosyl]-5-fluoro-2,4(1H,3H)-quinazolinedione

Cytidine, N-benzoyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-O-propyl-, 3′-[2-cyanoethyl bis(1-methylethyl)phosphoramidite]

Cytidine, N-benzoyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-O-pentyl-, 3′-[2-cyanoethyl bis(1-methylethyl)phosphoramidite]

Cytidine, N-benzoyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-O-nonyl-, 3′-[2-cyanoethyl bis(1-methylethyl)phosphoramidite]

Guanosine, N-(2-methyl-1-oxopropyl)-2′-O-octadecyl-

Guanosine, 2′-O-octadecyl-

Adenosine, 2-amino-2′-O-octadecyl-

Guanosine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-N-(2-methyl-1-oxopropyl)-2′-O-nonyl-, 3′-[2-cyanoethyl bis(1-methylethyl)phosphoramidite]

Thymidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-de(phosphinicooxy)thymidylylmethylene-1H-1,2,3-triazole-5,1-diyl-(3′→5′)-5′-deoxy-, 3′-[2-cyanoethyl bis(1-methylethyl)phosphoramidite]

Thymidine, 3′-de(phosphinicooxy)thymidylylmethylene-1H-1,2,3-triazole-5,1-diyl-(3′→5′)-5′-deoxy-