1-Oxaspiro(4.5)dec-3-en-2-one, 4-(4-bromobenzoyl)-3-methyl- 4-(4-Bromobenzoyl)-3-methyl-1-oxaspiro(4.5)dec-3-en-2-one 4-Bromobenzoyl-3 methyl-2 cyclohexane spiro-4,4-butene-2 olide-4 [French] 86560-10-3 BRN 5090893