[1] Acad Sci Czech Republ, Inst Organ Chem & Biochem, Gilead Sci, CR-16610 Prague 6, Czech Republic
[2] IOCB Res Ctr, Prague 16610 6, Czech Republic
[3] Acad Sci Czech Republ, Inst Biophys, Vvi, CS-61265 Brno, Czech Republic
[4] Masaryk Univ, Cent European Inst Technol, Brno 62500, Czech Republic
[5] Charles Univ Prague, Fac Sci, Dept Organ Chem, Prague 12843 2, Czech Republic