1-Oxa-3,9-diazaspiro(5.5)undecan-2-one, 5-ethyl-9-(3-(p-fluorobenzoyl)propyl)- 54981-17-8 BRN 0566898 Oxo-2 ethyl-5 ((fluoro-4 benzoyl)-3 propyl)-9 oxadiaza-1,3,9 spiro(5,5)undecane [French]