1. Institute of Pharmaceutical Sciences, Department of Pharmacognosy, Karl-Franzens-University Graz, Universitätsplatz 4, 8010 Graz, Austria, Institute of Pharmaceutical Sciences, Department of Pharmaceutical Chemistry, Karl-Franzens-University Graz, Universitätsplatz 1, 8010 Graz, Austria, Swiss Tropical and Public Health Institute, Socinstrasse 57, 4002 Basel, Switzerland, and Laboratorio de Química Orgánica e Investigaciones Aplicadas, Escuela Politécnica Nacional, Ladrón de Guebara E11-253, PO Box 17-01...