5-[[4-[[4-[(3-Carboxy-4-chlorophenyl)amino]phenyl]phenylmethylene]-2,5-cyclohexadien-1-ylidene]amino]-2-chlorobenzoic acid

5-[[4-[[4-[(3-carboxy-4-chlorophenyl)amino]phenyl]phenylmethylene]-2,5-cyclohexadien-1-ylidene]amino]-2-chlorobenzoic acid