1. Laboratory of Organic Chemistry, Department of Chemistry, University of Athens, Panepistimiopolis, Athens 15771, Greece, Department of Chemistry and Biochemistry, Department 0601, University of CaliforniaSan Diego, La Jolla, California 92093-0601, Chemical Laboratories, Agricultural University of Athens, Athens 11855, Greece, and Department of Pharmaceutical Chemistry, School of Pharmacy, Aristotelian University of Thessaloniki, Thessaloniki 54124, Greece