1. Department of Chemical Science and Technologies, University of Rome Tor Vergata, Via della Ricerca Scientifica 1, 00133 Rome, Italy
2. RBM-Merck (an affiliate of Merck KGaA), Via Ribes 1, 10010 Turin, Italy
3. Merck KGaA, Frankfurter Strasse 250, 64293 Darmstadt, Germany