Abstract Previous studies have shown that several imidazole derivatives posses affinity to histamine H 3 and H 4 receptors. Continuing our study on structural requirements responsible for affinity and selectivity for H 3/H 4 receptor subtypes, two series of 3-(1H- imidazol-4-yl) propyl carbamates were prepared: a series of unsaturated alkyl derivatives (1– 9) and a series possessing a cycloalkyl group different distances to the carbamate moiety ...