Ginger ingredients and synthetic analogues: Synthesis and interaction with functional 5-HT3 receptors: R. Roth-Ehranga), H. Pertzb), S. Elzb), J. Lehmann∗a) a) Institute of Pharmacy, University of Bonn, An der Immenburg 4, D-53121 Bonn, Germany. b) Fachbereich Pharmazie, Freie Universität Berlin, Königin-Luise-Str. 2+4, D-14195 Berlin, Germany