InChI=1/C12H22O4/c1-9(2)6-12(3,7-10(13)15-4)8-11(14)16-5/h9H,6-8H2,1-5H dimethyl 3-isobutyl-3-methylpentanedioate pentanedioic acid, 3-methyl-3-(2-methylpropyl)-, dimethyl ester