[1] CNR,IST PSICOBIOL & PSICOFARMACOL,VIA RENO 1,I-00198 ROMA,ITALY
[2] UNIV ROME LA SAPIENZA,DEPT CHIM BIOL & STRUTTURIST CHIM,CATTEDRA CHIM FARMACEUT,I-00185 ROME,ITALY
[3] UNIV MED A GEMELLI,IST CHIM & PROPEDEUT BIOCHIM,I-00168 ROMA,ITALY
[4] MEDIOLANUM FARMACEUT,MILANO,ITALY