text: << Olopatadine hydrochloride >> (olopatadine, 11-[(Z)-3-(dimethylamino)propylidene]-6,11-dihydrodibenz[b,e]oxepin-2-acetic acid monohydrochloride) is a novel antiallergic/[[ histamine H1-receptor ]] antagonistic drug that was synthesized and evaluated in our laboratories.