1. Centre de Recherche en Microbiologie Appliquée, Université du Québec, Institut Armand-Frappier, 531 Boulevard des Prairies, Laval, Québec, Canada H7N 4Z3, Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal, Quebec, Canada H3Z 2K6, and Biomedical Mass Spectrometry Unit, McGill University, 1130 Pine Avenue West, Montreal, Quebec, Canada H3A 1A3