1,3-Dioxolane,2,2-dimethyl-4-[4,4,5,5,6,6,7,7,8,8,9,9,9-tridecafluoro-1-methoxy-1-(3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluorooctyl)nonyl]-