1,3-dioxole, 2,4-dimethyl-2-(4-methyl-3-pentenyl)- 2,4-dimethyl-2-(4-methylpent-3-en-1-yl)-1,3-dioxole InChI=1/C11H18O2/c1-9(2)6-5-7-11(4)12-8-10(3)13-11/h6,8H,5,7H2,1-4H