1-Oxa-3,9-diazaspiro(5.5)undecan-2-one, 9-(3-(p-fluorobenzoyl)propyl)-5-methyl- 54981-16-7 BRN 0565213 Oxo-2 methyl-5 ((fluoro-4 benzoyl)-3 propyl)-9 oxadiaza-1,3,9 spiro(5,5)undecane [French]