1. Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, v.v.i, Gilead Sciences & IOCB Research Centre, Flemingovo nám. 2, 166 10 Prague 6, Czech Republic
2. Department of Chemistry
of Natural Compounds, Institute of Chemical Technology Prague, Technická
5, Prague 166 28, Czech Republic
3. Institute of Medical Virology, Justus Liebig University Giessen, Schubertstrasse 81, D-35392 Giessen, Germany
4. Gilead Sciences, Inc., 333 Lakeside Drive, Foster City, California 94404, United States