1. Center for Advanced Biotechnology and Medicine, 679 Hoes Lane, Piscataway, New Jersey 08854-5638, Department of Chemistry, Rutgers University, P.O. Box 939, Piscataway, New Jersey 08855-0939, The Cancer Institute of New Jersey, New Brunswick, New Jersey 08901, and Department of Molecular Biology and Biochemistry, Rutgers University, New Brunswick, New Jersey 08903