1. Department
of Chemistry, University of Massachusetts Boston, 100 Morrissey Boulevard,
Boston, Massachusetts 02125, United States
2. Shanghai Key Laboratory of Chemical
Biology, Institute of Pesticides and Pharmaceuticals, East China University of Science and Technology, Shanghai
200237, P. R. China
3. Department
of Applied Chemistry, National Chiao Tung University, Hsinchu 300-10, Taiwan
(ROC)
4. Department of Chemistry, Keene State College, 220 Main Street, Keene, New Hampshire
03435, United States