1. Department of Chemistry and Biochemistry, The University of Southern Mississippi, 118 College Drive, # 5043, Hattiesburg, MS 39406‐0001, U.S.A., Fax: +1‐601‐266‐6075
2. Department of Chemistry, Georgia State University, P. O. Box 4098, Atlanta, GA 30302, U.S.A.
3. Science Division, Lyon College, Batesville, AR 72501, U.S.A.
4. Department of Chemistry and Biochemistry, Jackson State University, P. O. Box 17910, 1400 JR Lynch Street, Jackson, MS 39217, U.S.A.
5. Bioactive Botanical Research Laboratory, Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy, University of Rhode Island, Kingston, RI 02881, U.S.A.
6. Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803, U.S.A.
7. Molecular Structure Centre, Chemistry Department, Clemson University Clemson, SC 29634‐0973, U.S.A.
8. School of Polymers and High‐Performance Materials, The University of Southern Mississippi, 118 College Dive, #5050, Hattiesburg, MS 39406‐0076, U.S.A.