1. 1Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, USA
2. 2Department of Plant and Microbial Biology, North Carolina State University, Raleigh, North Carolina 27695-7615, USA
3. 3Enloe Magnet High School, Raleigh, North Carolina 27610, USA
4. 4Department of Chemistry, University of Hawaii at Manoa, Honolulu, Hawaii 96822-2275, USA