1. Institute for Research in Biomedicine, Barcelona Science Park, University of Barcelona, 08028-Barcelona, Spain, Laboratory of Organic Chemistry, Faculty of Pharmacy, University of Barcelona, 08028-Barcelona, Spain, PharmaMar S.A.U., 28770-Colmenar Viejo (Madrid), Spain, and Department of Organic Chemistry, University of Barcelona, Martí i Franqués 1, 08028-Barcelona, Spain