The present invention relates to novel compounds according to the general Formulae (I, II, III, IV or V); wherein B is nucleoside base according to the structure Formula (VI); R is H, F, Cl, Br, I, C 1 -C 4 alkyl (preferably CH 3 ), -C N, -C C-R a , Formula (VII); X is H, C 1 -C 4 alkyl (preferably
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