Carbamic acid, [1-[2-deoxy-3,5-O-[1,1,3,3-tetrakis(1-methylethyl)-1,3-disiloxanediyl]-β-D-erythro-pentofuranosyl]-1,2-dihydro-6,7-dimethyl-2-oxo-4-pteridinyl]-, 2-(4-nitrophenyl)ethyl ester

Cytidine, 3′-C-ethynyl-, 5′-(4-chlorobenzoate) 2′,3′-bis(2-methylpropanoate)

Cytidine, 3′-C-[(trimethylsilyl)ethynyl]-, 5′-(4-chlorobenzoate) 2′,3′-bis(4-methylbenzoate)

Cytidine, 3′-C-[(trimethylsilyl)ethynyl]-, 5′-(4-chlorobenzoate) 2′,3′-bis(2-methylpropanoate)

Uridine, 3′-C-ethynyl-, 5′-(4-chlorobenzoate) 2′,3′-bis(ethyl carbonate)

Uridine, 3′-C-ethynyl-, 5′-(4-chlorobenzoate) 2′,3′-bis(4-nitrobenzoate)

Uridine, 3'-C-ethynyl-, 2',3',5'-tris(4-chlorobenzoate)

Uridine, 3′-C-ethynyl-, 5′-(4-chlorobenzoate) 2′,3′-bis(4-methylbenzoate)

Uridine, 3′-C-ethynyl-, 2′,3′-dibenzoate 5′-(4-chlorobenzoate)

Uridine, 3′-C-ethynyl-, 5′-(4-chlorobenzoate) 2′,3′-bis(2-methylpropanoate)

Uridine, 3′-C-ethynyl-, 5′-(4-chlorobenzoate) 2′,3′-dipropanoate

Uridine, 3′-C-ethynyl-, 2′,3′-diacetate 5′-(4-chlorobenzoate)

Uridine, 3′-C-[(trimethylsilyl)ethynyl]-, 5′-(4-chlorobenzoate) 2′,3′-bis(4-methylbenzoate)

Uridine, 3′-C-[(trimethylsilyl)ethynyl]-, 5′-(4-chlorobenzoate) 2′,3′-bis(2-methylpropanoate)

Cytidine, 3′-C-[(trimethylsilyl)ethynyl]-, 2′,3′,5′-tris(4-chlorobenzoate)

Uridine, 3′-C-[(trimethylsilyl)ethynyl]-, 2′,3′,5′-tris(4-chlorobenzoate)

3-Iodo-4-methoxy-1-[2,3,5-tris-O-(4-chlorobenzoyl)-β-D-ribofuranosyl]-1H-pyrazolo[3,4-d]pyrimidin-6-amine

1-[3,5-Bis-O-(4-chlorobenzoyl)-2-deoxy-β-D-erythro-pentofuranosyl]-3-iodo-4-methoxy-1H-pyrazolo[3,4-d]pyrimidin-6-amine