1. Gilead & IOCB Research Center, Institute of Organic Chemistry and Biochemistry, v. v. i., Academy of Sciences of the Czech Republic, Flemingovo nám. 2, 16610 Prague 6, Czech Republic, Fax: +420‐220183559
2. Institute of Biophysics, v. v. i., Academy of Sciences of the Czech Republic, Královopolská 135, 61265 Brno, Czech Republic
3. Center for Complex Molecular Systems and Biomolecules, Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo nám. 2, 16610 Prague 6, Czech Republic
4. Gilead Sciences, Inc., 333 Lakeside Drive, Foster City, CA 94404, USA