1497-16-1 5-21-10-00068 (Beilstein Handbook Reference) 6-AZASPIRO(3,4)OCTANE-5,7-DIONE 6-Azaspiro(3.4)octane-5,7-dione Aza-6-spiro(3,4)octane-dione-5,7 [French] BRN 1525974 EINECS 216-090-1 LD 4070