4-(2-Azaspiro(4.4)non-2-yl)-4'-fluoro-butyrophenone 5-20-04-00355 (Beilstein Handbook Reference) 64-63-1 BRN 1430287 BUTYROPHENONE, 4-(2-AZASPIRO(4.4)NON-2-YL)-4'-FLUORO-