29122-07-4 4-Ethyl-4'-(1,2,3,4-tetrahydro-2-naphthyl)-2-oxospiro(oxazolidine-5,4'-piperidine) Spiro(oxazolidine-5,4'-piperidine), 4-ethyl-1'-(1,2,3,4-tetrahydro-2-naphthyl)-2-oxo-