1-oxaspiro[5.5]undec-4-ene, 4-methyl- 4-methyl-1-oxaspiro[5.5]undec-4-ene InChI=1/C11H18O/c1-10-5-8-12-11(9-10)6-3-2-4-7-11/h9H,2-8H2,1H