1,3-Dihydro-3-phenyl-1'-(2-propynyl)-spiro(isobenzofuran-1,4'-piperidine) 3-Phenyl-1'-(2-propynyl)spiro(isobenzofuran-1(3H),4'-piperidine) 61298-57-5 Spiro(isobenzofuran-1(3H),4'-piperidine), 3-phenyl-1'-(2-propynyl)-