(1-methylethylidene)di-4,1-phenylene bis(6-diazo-5,6-dihydro-5-oxonaphthalene-1-sulphonate);Bis(6-diazo-5,6-dihydro-5-oxo-1-naphthalenesulfonic acid)propane-2,2-diylbis(4,1-phenylene) ester
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