1-(3,3'-Diphenyl-4-oxohexyl)piperidine-4-spiro-1'(1',2',3',4'-tetrahydronaphthalene) oxalate 101564-56-1 3-Hexanone, 4,4-diphenyl-6-(2,3-dihydrospiro(naphthalene-1(4H),4'-piperid)-1'-yl)-, oxalate