A series of imidazole-containing (non-)chiral carbamates were tested at human histamine H-3 receptor (H3R). All compounds displayed K-i values below 100 nM. A trend for a stereoselectivity at human H3R was observed for the chiral alpha-branched ligands. Selected compounds were also tested at human histamine H-4 receptor and showed moderate to weak affinities (118-1460 nM). (C) 2009 Elsevier Ltd. All rights reserved.