1-azaspiro[4.5]deca-1,3,6,9-tetraen-8-one, 2-ethoxy-4-phenyl- 2-ethoxy-4-phenyl-1-azaspiro[4.5]deca-1,3,6,9-tetraen-8-one InChI=1/C17H15NO2/c1-2-20-16-12-15(13-6-4-3-5-7-13)17(18-16)10-8-14(19)9-11-17/h3-12H,2H2,1H