olopatadine [ 11-(3-(dimethylamino)propylidene)-6,11-dihydrodibenz(b,e)oxepin-2-acetic acid,Alcon Brand of Olopatadine Hydrochloride,KW 4679,KW-4679,KW-4943A,Patanol,olopatadine hydrochloride ] structure given in first source; analog of KW-4994; a prospective orally active antiallergic agent