3,4-Dihydrospiro(naphthalene-2(1H),3'-pyrrolidine)-2',5'-dione 4-21-00-05530 (Beilstein Handbook Reference) 7,8-Benzo-2-azaspiro(4.5)decane-1,3-dione 98054-83-2 BRN 0012403 S.2-823 Spiro(naphthalene-2(1H),3'-pyrrolidine)-2',5'-dione, 3,4-dihydro-