1-Oxa-3,8-diazaspiro(4.5)decan-2-one, 8-(2-(4-fluorophenyl)ethyl)-3-methyl-4-methylene- 134069-72-0 8-(2-(4-Fluorophenyl)ethyl)-3-methyl-4-methylene-1-oxa-3,8-diazaspiro(4.5)decan-2-one