1-Oxaspiro(4.5)dec-3-en-2-one, 4-(4-fluorobenzoyl)-3-methyl- 4-(4-Fluorobenzoyl)-3-methyl-1-oxaspiro(4.5)dec-3-en-2-one 4-Fluorobenzoyl-3 methyl-2 cyclohexane spiro-4,4-butene-2 olide-4 [French] 86560-07-8 BRN 5089759