[1] Univ Roma La Sapienza, Dipartimento Studi Farmaceut, Ist Pasteur Fdn Cenci Bolognetti, Rome, Italy
[2] Univ Siena, Dipartimento Farmaco Chim Tecnol, I-53100 Siena, Italy
[3] Univ Naples Federico II, Dipartimento Chim Farmaceut & Tossicol, Naples, Italy
[4] Univ Cagliari, Sez Microbiol, Dipartimento Med Sperimentale, I-09042 Cagliari, Italy