4'-(Methylamino)methylspiro(5H-dibenzo(a,d)cycloheptene-5,2'-(1',3')dioxolane) maleate 52467-33-1 Spiro(5H-dibenzo(a,d)cycloheptene-5,2'-(1',3')dioxolane), 4'-(methylamino)methyl-, maleate