52740-45-1 6,11-Dihydro-4'-(butylamino)methylspiro(dibenz(b,e)oxepin-11,2'-(1',3')-dioxolane) maleate Spiro(dibenz(b,e)oxepin-11,2'-(1',3')dioxolane), 6,11-dihydro-4'-(butylamino)methyl-, maleate