Affiliation: | 1. Nucleoside Research Unit , University of Antwerp (RUCA) , Groenenborgerlaan 171, Antwerpen, B-2020, BELGIUM;2. NMR Research Unit. University of Antwerp (RUCA) , Groenenborgerlaan 171, Antwerpen, B-2020, BELGIUM;3. Rega Institute for Medical Research. Katholieke Universiteit Leuven , Minderbroedersstraat 10, Leuven, B-3000, BELGIUM |