1. Texas A&M University at Galveston, 5007 Avenue U, Galveston, Texas 77551, Institute of Physical Chemistry “I. G. Murgulescu” of the Romanian Academy, Splaiul Independentei 202, Bucharest 77208, Romania, Center of Organic Chemistry “C. D. Nenitzescu” of the Romanian Academy, Splaiul Independentei 202A, Bucharest 77208, Romania, and Department of Biology and Molecular Biochemistry, University of Texas Medical Branch, 301 University Boulevard, Galveston, Texas 77555