3',4'-Dihydro-1-ethylspiro(imidazolidine-4,2'(1'H)-naphthalene)-2,5-dione 7,8-Benzo-3-ethyl-1,3-diazaspiro(4.5)decane-2,4-dione S.2-870 Spiro(imidazolidine-4,2'(1'H)-naphthalene)-2,5-dione, 3',4'-dihydro-1-ethyl- WH1310800