1-Oxaspiro(4.5)dec-3-en-2-one, 3-methyl-4-(4-methylbenzoyl)- 3-Methyl-4-(4-methylbenzoyl)-1-oxaspiro(4.5)dec-3-en-2-one 4-Methylbenzoyl-3 methyl-2 cyclohexane spiro-4,4-butene-2 olide-4 [French] 86560-11-4 BRN 5081573