1. Department of Pharmaceutical Sciences, School of Pharmacy, University of Southern California, 1985 Zonal Avenue, PSC 304, Los Angeles, California 90089, Department of Pharmaceutical Sciences, College of Pharmacy, University of Tennessee Health Sciences Center, 847 Monroe Avenue Suite 327, Memphis, Tennessee 38163, and Department of Chemical Technology of Drugs, Medical University of Gdansk, 80-416 Gdansk, Poland