2-Benzoquinonecarboxylic acid 2-Benzoylbenzoic acid 2-Carboxybenzophenone 85-52-9 Benzoic acid, 2-benzoyl- Benzoic acid, o-benzoyl- Benzophenone-2-carbonic acid Benzophenone-2-carboxylic acid NSC6646 o-Benzoylbenzoic acid