[1] Univ Salerno, Dipartimento Sci Farmaceut, I-84084 Fisciano, Salerno, Italy
[2] Univ Palermo, Dipartimento Chim Organ E Paterno, I-90128 Palermo, Italy
[3] Univ Palermo, Dipartimento Sci Bot, I-90133 Palermo, Italy
[4] Univ Naples Federico II, Dipartimento Chim Sostanze Nat, I-80131 Naples, Italy