Patent ID: 8501709

Claim:
A compound represented by the general formula (II): wherein: X 1 , X 2 , X 3 , X 4 and X 5 are each —O—, B is selected from the group consisting of adeninyl, thyminyl, uracilyl, cytosinyl and guaninyl, R 1 and R 2 are each independently selected from the group consisting of hydrogen, alkyl and P(O)(OH)—O—PO 3 H 2 , provided that when one of R 1 and R 2 is P(O)(OH)—O—PO 3 H 2 , the other one is hydrogen; R 4 and R 5 are each independently selected from the group consisting of hydrogen and OR 14 ; R 3 , R 6 , R 7 and R 8 are each hydrogen; R 14 is hydrogen or arylalkyl; and n is an integer representing the number of methylene groups between X 2 and P, and is selected from 1, 2, 3, 4, 5 and 6; and pharmaceutically acceptable salts and stereoisomers thereof.