InChI=1/C11H18O4/c1-5-6-7-9(11(13)15-4)8(2)10(12)14-3/h9H,2,5-7H2,1,3-4H butanedioic acid, 2-butyl-3-methylene-, dimethyl ester dimethyl 2-butyl-3-methylenesuccinate