[1] Natl & Kapodistrian Univ Athens, Dept Pharm, Div Pharmaceut Chem, Athens 15771, Greece
[2] Katholieke Univ Leuven, Rega Inst Med Res, Dept Microbiol Immunol & Transplantat, Lab Virol & Chemotherapy, Herestraat 49, 3000 Leuven, B-1043 Leuven, Belgium
[3] Goethe Univ Frankfurt, Inst Pharmaceut Chem, Dept Biochem Chem & Pharm, Max von Laue Str 9, D-60438 Frankfurt, Germany
[4] Goethe Univ Frankfurt, Buchmann Inst Mol Life Sci, Struct Genom Consortium, Max von Laue Str 15, D-60438 Frankfurt, Germany