(2Z,2'Z)-2,2'-[(1Z,2Z)-3,3,4,4,5,5-hexamethylcyclopentane-1,2-diylidene]diacetic acid InChI=1/C15H22O4/c1-13(2)9(7-11(16)17)10(8-12(18)19)14(3,4)15(13,5)6/h7-8H,1-6H3,(H,16,17)(H,18,19)/b9-7+,10-8 acetic acid, 2,2'-[(1Z,2Z)-3,3,4,4,5,5-hexamethyl-1,2-cyclopentanediylidene]bis-, (2Z,2'Z)-