34753-50-9 4'-(Dimethylamino)methylspiro(5H-dibenzo(a,d)cycloheptene-5,2'-(1',3')dioxolane) maleate Spiro(5H-dibenzo(a,d)cycloheptene-5,2'-(1',3')dioxolane), 4'-(dimethylamino)methyl-, maleate