6-(6-carboxynaphthalen-2-yl)naphthalene-2-carboxylic acid; 2,2′-Binaphthalene-6,6′-dicarboxylic Acid; 2,2'-Binaphthalene-6,6'-dicarboxylic Acid; [2,2'-Binaphthalene]-6,6'-dicarboxylic Acid; 2,2’-Binaphthyl-6,6'-dicarboxylic acid; Adapalene Related Compound E (USP)