[1] UNIV CALIF SANTA BARBARA,INST POLYMERS & ORGAN SOLIDS,SANTA BARBARA,CA 93106
[2] UNIV CALIF SANTA BARBARA,DEPT CHEM & PHYS,SANTA BARBARA,CA 93106
[3] UNIV TRIESTE,DIPARTIMENTO SCI FARMACEUT,I-34127 TRIESTE,ITALY
[4] CNR,CTR MECCAN REAZIONI ORGAN,DIPARTIMENTO CHIM ORGAN,I-35131 PADUA,ITALY