1. School of Physics & Complex and Adaptive Systems Laboratory
2. University College Dublin
3. Dublin 4, Ireland
4. Institute of Organic Chemistry and Biochemistry
5. Gilead Sciences Research Center & IOCB
6. Academy of Sciences of the Czech Republic
7. 166 10 Praha 6, Czech Republic
8. Instituto de Química Médica (CSIC)
9. 28006-Madrid, Spain