1. Department of Chemistry, Center for Chemical Methodology and Library Development (CMLD‐BU), Boston University, 590 Commonwealth Avenue, Boston, MA 02215 (USA), Fax: (+1) 617‐358‐2847
2. Toxicology and Pharmacology Branch, National Cancer Institute at Frederick, MD (USA)
3. Screening Technologies Branch, Developmental Therapeutics, Program, Division of Cancer Treatment and Diagnosis, National Cancer Institute at Frederick, MD (USA)
4. Molecular Targets Development Program, National Cancer Institute at Frederick, MD (USA)