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N-[(3E)-9-[2-(ethoxycarbonyl)phenyl]-6-(ethylamino)-2,7-dimethyl-3H-xanthen-3-ylidene]ethanaminium (3E)-3-(2-{4-[({2-methoxy-4-[(E)-(3-sulfophenyl)diazenyl]phenyl}carbamoyl)amino]phenyl}hydrazinyliden related products: