1. Department of Chemistry, Center
for Chemical Methodology and Library Development (CMLD-BU), Boston University, 590 Commonwealth Avenue, Boston,
Massachusetts 02215, United States
2. Department of Chemistry and
Centre of Biotechnology, Brock University, 500 Glenridge Avenue, St. Catharines, ON, L2S 3A1, Canada
3. Molecular Targets Laboratory, National Cancer Institute, Frederick, Maryland 21702,
United States