1-Oxa-3,9-diazaspiro(5.5)undecan-2-one, 9-(3-(p-fluorobenzoyl)propyl)- 54981-15-6 BRN 0560044 Oxo-2 ((fluoro-4 benzoyl)-3 propyl)-9 oxadiaza-1,3,9 spiro(5,5)undecane [French]