1. Departamento de Físico-Química, Facultad de Ciencias Químicas, Universidad de Concepción, 4070386 Concepción, Chile
2. Departments of Pharmaceutical Sciences and Chemistry, 147 Bison Modular, University of California, Irvine, Irvine, California 92617, United States
3. Center for Molecular Modeling (CMM), Ghent University, Technologiepark 903, B-9052 Ghent, Belgium