1. Department of Chemistry, Faculty of Biotechnologies, University of Agricultural Sciences and Veterinary Medicine, B-dul Marasti 59, 71331-Bucharest, Romania, Department of Organic Chemistry, Polytechnic University, Splaiul Independentei 313, Bucharest, Romania, Laboratorio di Chimica Inorganica e Bioinorganica, Università degli Studi, Via Gino Capponi 7, I-50121, Florence, Italy, and “C.D. Nenitzescu” Institute of Organic Chemistry, Splaiul Independentei 202B, Bucharest, Romania