(2R,3S,3aS,9aR)-2-(2-Azidoethyl)-3a,9a-dihydro-3-(phenylmethoxy)-2-[(phenylmethoxy)methyl]-2H,3H,6H-furo[2′,3′:4,5]oxazolo[3,2-a]pyrimidin-6-one

5-[2-Deoxy-3,5-bis-O-(4-methylbenzoyl)-β-D-erythro-pentofuranosyl]-1,3-dioxolo[4,5-g]quinazoline-6,8(5H,7H)-dione

5-[2-Deoxy-3,5-bis-O-(4-methylbenzoyl)-α-D-erythro-pentofuranosyl]-1,3-dioxolo[4,5-g]quinazoline-6,8(5H,7H)-dione

1-[2-O-Benzoyl-3-deoxy-5-O-[hydroxy[[hydroxy[[hydroxy[2-(1-pyrenylsulfonyl)ethoxy]phosphinyl]oxy]phosphinyl]oxy]phosphinyl]-β-L-erythro-pentofuranosyl]-5-methyl-2,4(1H,3H)-pyrimidinedione