[1] Department of Chemistry, Kansas State University, Manhattan, KS 66506, United States
[2] Department of Geology, Southern Illinois University 4324, Carbondale, IL 62901, United States
[3] Department of Chemistry, Southern Illinois University 4409, Carbondale, IL 62901, United States
[4] Department of Biology, Kansas State University, Manhattan, KS 66506, United States
[5] Div. of Experimental Therapeutics, Walter Reed Army Inst. of Research, Washington, DC 20307-5100, United States
[6] Faculté de Chimie, Université Louis Pasteur, 67008 Strasbourg, France