1. Department of Pharmacology and Therapeutics, McGill University, Montréal, QC Canada H3G 1Y6, Humboldt-Universität zu Berlin Institut für Physik, AG Photobiophysik, Newtonstrasse 15 D-12489 Berlin, Germany, and Department of Chemistry and Faculty of Pharmacy, Université de Montréal, CP 6128 Succursale Centre Ville, Montréal, QC Canada H3C 3J7