1. Hillman
Cancer Center, University of Pittsburgh Medical Center, 5117
Centre Avenue, Pittsburgh, Pennsylvania 15213, United States
2. Department
of Chemistry and Biochemistry, San Diego State University, 5500
Campanile Drive, San Diego, California 92182-1030, United States
3. Department
of General, Organic and Biomedical Chemistry, University of Mons, 7000 Mons, Hainaut, Belgium
4. Department
of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093-0385, United States