1. Division of Pharmacognosy, Department of Medicinal Chemistry, Biomedical Centre, Uppsala University, PO Box 574, SE-751 23 Uppsala, Sweden, Unit for Organic Chemistry, Department of Biosciences, Karolinska Institute, Novum Research Park, SE-141 57 Huddinge, and Södertörn University College, SE-141 04 Huddinge, Sweden, Department of Cell and Molecular Biology, Tjärnö Marine Biological Laboratory, Göteborg University, SE-452 96 Strömstad, Sweden, Department of Chemistry, Swedish University of Agricultural...