1. Faculdade de Ciências Farmacêuticas de Ribeirão Preto; USP; Ribeirão Preto; Brazil
2. Department of Chemistry and Biochemistry; University of Arizona; Tucson; AZ; USA
3. Radiation Biology Branch; National Cancer Institute; National Institutes of Health; Bethesda; MD; USA
4. Department of Chemistry; Sonoma State University; Rohnert Park; CA; USA