1. Department of Chemical and Geological Sciences, University of Cagliari, Cittadella Universitaria, Monserrato, CA, Italy;
2. State Institute of Higher Education “Michele Giua”, Cagliari, Italy;
3. Department of Life and Environmental Sciences, Botany section, University of Cagliari, Cagliari, Italy;
4. CIEPQPF and Faculty of Pharmacy, University of Coimbra, Coimbra, Portugal