Download PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... Benzo[b]thiophene-2-carboxamides and benzo[b]furan-2-carboxamides have been found to be antagonists on the human histamine-3-receptor, showing a K i value of as low as 4 nM. ... Benzo[b]thiophene-2-carboxamides and benzo[b]furan-2-carboxamides are potent ...