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(3Z)-3-(2-{4-[(E)-2-carboxyethenyl]phenyl}hydrazinylidene)-7-({[(6Z)-6-(2-{4-[(E)-2-carboxyethenyl]phenyl}hydrazinylidene)-5-oxo-7-sulfonato-5,6-dihydronaphthalen-2-yl]carbamoyl}amino)-4-oxo-3,4-dihyd related products: