4'-(Ethylamino)methylspiro(5H-dibenzo(a,d)cycloheptene-5,2'-(1',3')dioxolane) maleate 52467-35-3 Spiro(5H-dibenzo(a,d)cycloheptene-5,2'-(1',3')dioxolane), 4'-(ethylamino)methyl-, maleate