1. Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Gilead Sciences & IOCB Research Center, Flemingovo nam. 2, CZ-16610 Prague 6, Czech Republic
2. Laboratory of Experimental Medicine, Faculty of Medicine, Palacky University, Puškinova 6, Olomouc 77520, Czech Republic
3. Gilead Sciences, Inc., 333 Lakeside Drive, Foster City, California 94404, U.S.A.