Acknowledgments
The project directors (R.A.B and K.D.B.) gratefully acknowledge the support of this research by the Stephenson Cancer Research Center/Oklahoma Tobacco Settlement Endowment Trust (TSET). The authors are also indebted to the Oklahoma State University College of Arts and Sciences for funds to purchase several departmental instruments including an FT-IR and a 400 MHz NMR unit for the Statewide NMR facility. This NMR facility was initially established with support from NSF (BIR-9512269), the Oklahoma State Regents for Higher Education, the W. M. Keck Foundation, and Conoco, Inc.