InChI=1/C17H26O4/c1-15(2)11(9-13(18)20-7)12(10-14(19)21-8)16(3,4)17(15,5)6/h9-10H,1-8H3/b11-9+,12-10 acetic acid, 2,2'-(3,3,4,4,5,5-hexamethyl-1,2-cyclopentanediylidene)bis-, dimethyl ester, (2Z,2'Z)- dimethyl (2Z,2'Z)-2,2'-(3,3,4,4,5,5-hexamethylcyclopentane-1,2-diylidene)diacetate