4'-Fluoro-4-(8-methyl-3-azaspiro(5.5)undec-3-yl)butyrophenone 5-20-04-00449 (Beilstein Handbook Reference) 64-56-2 BRN 1348997 BUTYROPHENONE, 4'-FLUORO-4-(8-METHYL-3-AZASPIRO(5.5)UNDEC-3-YL)-