3',4'-Dihydrospiro(imidazolidine-4,1'(2'H)-naphthalene)-2,5-dione 4-24-00-01553 (Beilstein Handbook Reference) 57998-96-6 BRN 0017226 CB 1718 Spiro(imidazolidine-4,1'(2'H)-naphthalene)-2,5-dione, 3',4'-dihydro-