Guanosine, 1′-(7-amino-4,5-dihydro-4-oxo-1H-imidazo[4′,5′:4,5]pyrido[2,3-d]pyrimidin-1-yl)-1′-de(6-amino-9H-purin-9-yl)-2′-deoxyadenylyl-(3′→5′)-2′-deoxycytidylyl-(3′→5′)-2′-deoxyguanylyl-(3′→5′)-2′-deoxycytidylyl-(3′→5′)-2′-deoxyguanylyl-(3′→5′)-2′-deoxycytidylyl-(3′→5′)-2′-deoxy-

Guanosine, 1′-(4-amino-5,7-dihydro-7-oxo-1H-imidazo[4′,5′:4,5]pyrido[2,3-d]pyrimidin-1-yl)-1′-de(6-amino-9H-purin-9-yl)-2′-deoxyadenylyl-(3′→5′)-2′-deoxycytidylyl-(3′→5′)-2′-deoxyguanylyl-(3′→5′)-2′-deoxycytidylyl-(3′→5′)-2′-deoxyguanylyl-(3′→5′)-2′-deoxycytidylyl-(3′→5′)-2′-deoxy-

Guanosine, 1′-de(6-amino-9H-purin-9-yl)-2′-deoxy-1′-(4,5,6,7-tetrahydro-4,7-dioxo-1H-imidazo[4′,5′:4,5]pyrido[2,3-d]pyrimidin-1-yl)adenylyl-(3′→5′)-2′-deoxycytidylyl-(3′→5′)-2′-deoxyguanylyl-(3′→5′)-2′-deoxycytidylyl-(3′→5′)-2′-deoxyguanylyl-(3′→5′)-2′-deoxycytidylyl-(3′→5′)-2′-deoxy-

Guanosine, 1′-de(6-amino-9H-purin-9-yl)-2′-deoxy-1′-(4,7-diamino-1H-imidazo[4′,5′:4,5]pyrido[2,3-d]pyrimidin-1-yl)adenylyl-(3′→5′)-2′-deoxycytidylyl-(3′→5′)-2′-deoxyguanylyl-(3′→5′)-2′-deoxycytidylyl-(3′→5′)-2′-deoxyguanylyl-(3′→5′)-2′-deoxycytidylyl-(3′→5′)-2′-deoxy-

7-Amino-1-(2-deoxy-β-D-erythro-pentofuranosyl)-1,5-dihydro-4H-imidazo[4′,5′:4,5]pyrido[2,3-d]pyrimidin-4-one

7-Amino-1-[2-deoxy-3,5-bis-O-[tris(1-methylethyl)silyl]-β-D-erythro-pentofuranosyl]-1,5-dihydro-4H-imidazo[4′,5′:4,5]pyrido[2,3-d]pyrimidin-4-one

Methyl 1-[2-deoxy-3,5-bis-O-[tris(1-methylethyl)silyl]-β-D-erythro-pentofuranosyl]-5-iodo-1H-imidazole-4-carboxylate

1,3-Bis(1,1-dimethylethyl) 2-[[1-[2-deoxy-3,5-bis-O-[tris(1-methylethyl)silyl]-β-D-erythro-pentofuranosyl]-5-iodo-1H-imidazol-4-yl]carbonyl]imidodicarbonate

4-Amino-1-(2-deoxy-β-D-erythro-pentofuranosyl)-1,5-dihydro-7H-imidazo[4′,5′:4,5]pyrido[2,3-d]pyrimidin-7-one

7H-Imidazo[4′,5′:4,5]pyrido[2,3-d]pyrimidin-7-one, 4-amino-1-[2-deoxy-3,5-bis-O-[tris(1-methylethyl)silyl]-β-D-erythro-pentofuranosyl]-1,5-dihydro-

1-[2-Deoxy-3,5-bis-O-[tris(1-methylethyl)silyl]-β-D-erythro-pentofuranosyl]-5-(1,2-dihydro-4-methoxy-2-oxo-5-pyrimidinyl)-1H-imidazole-4-carbonitrile

1-(2-Deoxy-β-D-erythro-pentofuranosyl)-1H-imidazo[4′,5′:4,5]pyrido[2,3-d]pyrimidine-4,7(5H,6H)-dione

1H-Imidazo[4′,5′:4,5]pyrido[2,3-d]pyrimidine-4,7(5H,6H)-dione, 1-[2-deoxy-3,5-bis-O-[tris(1-methylethyl)silyl]-β-D-erythro-pentofuranosyl]-

1-[2-Deoxy-3,5-bis-O-[tris(1-methylethyl)silyl]-β-D-erythro-pentofuranosyl]-5-(1,2-dihydro-4-methoxy-2-oxo-5-pyrimidinyl)-1H-imidazole-4-carboxamide

5-(2-Amino-4-methoxy-5-pyrimidinyl)-1-[2-deoxy-3,5-bis-O-[tris(1-methylethyl)silyl]-β-D-erythro-pentofuranosyl]-1H-imidazole-4-carboxamide

5-(2-Amino-4-methoxy-5-pyrimidinyl)-1-[2-deoxy-3,5-bis-O-[tris(1-methylethyl)silyl]-β-D-erythro-pentofuranosyl]-1H-imidazole-4-carbonitrile

1-(2-Deoxy-β-D-erythro-pentofuranosyl)-1H-imidazo[4′,5′:4,5]pyrido[2,3-d]pyrimidine-4,7-diamine

1-[2-Deoxy-3,5-bis-O-[tris(1-methylethyl)silyl]-β-D-erythro-pentofuranosyl]-1H-imidazo[4′,5′:4,5]pyrido[2,3-d]pyrimidine-4,7-diamine

7-Chloro-1-[2-deoxy-3,5-bis-O-[tris(1-methylethyl)silyl]-β-D-erythro-pentofuranosyl]-1H-imidazo[4′,5′:4,5]pyrido[2,3-d]pyrimidin-4-amine

7-Chloro-3-β-D-ribofuranosyl-3H-imidazo[4,5-c]pyridine