Bifendate Impurity F

5-((7,7′-dimethoxy-5′-(methoxycarbonyl)-[4,4′-bibenzo[d][1,3]dioxol]-6-yl)methyl) 5′-methyl 7,7′-dimethoxy-[4,4′-bibenzo[d][1,3]dioxole]-5,5′-dicarboxylate