1238-79-5 4-(7,9-Dimethyl-8-oxa-2-azaspiro(4.5)dec-2-yl)-4'-fluoro-butyrophenone BRN 1081731 BUTYROPHENONE, 4-(7,9-DIMETHYL-8-OXA-2-AZASPIRO(4.5)DEC-2-YL)-4'-FLUORO-