1-Oxa-3,8-diazaspiro(4.5)decan-2-one, 8-(4,4-bis(4-fluorophenyl)butyl)-3-methyl-4-methylene- 134069-69-5 8-(4,4-Bis(4-fluorophenyl)butyl)-3-methyl-4-methylene-1-oxa-3,8-diazaspiro(4.5)decan-2-one