1-cyclopentene-1,2-diacetic acid, 3,3,4,4,5,5-hexamethyl- 2,2'-(3,3,4,4,5,5-hexamethylcyclopent-1-ene-1,2-diyl)diacetic acid InChI=1/C15H24O4/c1-13(2)9(7-11(16)17)10(8-12(18)19)14(3,4)15(13,5)6/h7-8H2,1-6H3,(H,16,17)(H,18,19