1. Contribution from the Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, Department of Medicinal Chemistry, Royal Danish School of Pharmacy, Universitetsparken 2, DK-2100 Copenhagen, Denmark, Department of Organic Chemistry, Royal Institute of Technology, S-100 44 Stockholm, Sweden, Dipartimento di Chimica, Università di Napoli “Federico II”, via Mezzocannone 4, I-80134 Napoli, Italy, and Facoltà di Agraria, Università del Molise, via Tiberio 21/A, I-86100...