1. Department of Chemistry, Medical University of Lublin, Staszica 6, 20-081 Lublin, Poland, Gerontology Research Center, National Institute on Aging, National Institutes of Health, 5600 Nathan Shock Drive, Baltimore, Maryland 21224, and Advanced Biomedical Computing Center, National Cancer Institute-Frederick/SAIC, Post Office Box B, Building 430, Miller Drive, Frederick, Maryland 21702