1. Laboratory of Organic Chemistry, Faculty of Pharmacy, University of Barcelona, 08028-Barcelona, Spain; Institut de Ciència de Materials (CSIC), Campus UAB, 08193-Cerdanyola, Spain; Department of Biochemistry and Molecular Biology, Faculty of Chemistry, University of Barcelona, 08028-Barcelona, Spain; and Department of Physical Chemistry, Faculty of Pharmacy, University of Barcelona, 08028-Barcelona, Spain