1-oxaspiro[4.5]decan-2-one, 7,7-dimethyl-3-methylene- 7,7-dimethyl-3-methylene-1-oxaspiro[4.5]decan-2-one InChI=1/C12H18O2/c1-9-7-12(14-10(9)13)6-4-5-11(2,3)8-12/h1,4-8H2,2-3H