[1] Univ Siena, Dipartimento Farmacochim Tecnol, I-53100 Siena, Italy
[2] Univ Siena, Dipartimento Sci Chim & Biosistemi, I-53100 Siena, Italy
[3] CNR, Ist Studio Macromol, I-20133 Milan, Italy
[4] Univ Siena, Ctr Interdipartimento Anal & Determinaz Struttura, I-53100 Siena, Italy
[5] Rotta Res Lab SpA, I-20052 Monza, Italy