1-oxaspiro[4.5]deca-3,7-dien-2-one, 4,8-dimethyl- 4,8-dimethyl-1-oxaspiro[4.5]deca-3,7-dien-2-one InChI=1/C11H14O2/c1-8-3-5-11(6-4-8)9(2)7-10(12)13-11/h3,7H,4-6H2,1-2H