1. Department of Chemistry, University of Toronto, Toronto, Ontario, Canada, M5S 3H6, Velocet R & D, 210 Dundas Street West, Suite 810, Toronto, Ontario, Canada M5G 2E8, Department of Organic Chemistry, Eotvos University, H-1117, Budapest, Hungary, Department of Pharmacology and Pharmacotherapy, Szeged University, Dóm tér 12, H-6701, Szeged, Hungary, and Division of Cardiovascular Pharmacology, Hungarian Academy of Sciences and Szeged University, Dóm tér 12, H-6701, Szeged, Hungary