1,1'-Binaphthyl-4,4',5,5'-tetracarboxylic acid N,N-diphenyldiimide

1,3,1',3'-tetraoxo-2,2'-diphenyl-2,3,2',3'-tetrahydro-1H,1'H-[6,6']bi[benzo[de]isoquinolinyl]-7,7'-dicarboxylic acid dimethyl ester