1. Department of Chemistry, McGill University, 801 Sherbrooke St. West, Montreal, QC H3A 0B8, Canada
2. Department of Chemistry and Applied Biosciences, Institute of Pharmaceutical Sciences, ETH Zurich, Vladimir-Prelog-Weg 1–5, 8093 Zurich, Switzerland
3. Instituto de Química Física ‘Rocasolano’, CSIC, Serrano 119, 28006 Madrid, Spain