1-Oxa-3,8-diazaspiro(4.5)decan-2-one, 8-(4,4-bis(4-fluorophenyl)butyl)-4-methylene-3-propyl- 134069-52-6 8-(4,4-Bis(4-fluorophenyl)butyl)-4-methylene-3-propyl-1-oxa-3,8-diazaspiro(4.5)decan-2-one