4'-(Propylamino)methylspiro(5H-dibenzo(a,d)cycloheptene-5,2'-(1',3')dioxolane) maleate 52467-37-5 Spiro(5H-dibenzo(a,d)cycloheptene-5,2'-(1',3')dioxolane), 4'-(propylamino)methyl-, maleate