1. Department of Structural and Computational Biology Max F. Perutz Laboratories University of Vienna Dr.-Bohr-Gasse 9 1030 Vienna Austria
2. Department of Chemistry of Natural Compounds University of Chemistry and Technology Technická 5 166 28 Prague Czech Republic
3. Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences Gilead Sciences & IOCB Research Centre Czech Academy of Sciences Flemingovo nám. 2 166 10 Prague Czech Republic
4. Research Institute of Green Science and Technology Shizuoka University 836 Ohya, Suruga-ku Shizuoka 422-8529 Japan