methylenebis(3-hydroxy-5-methyl-4,1-phenylene) tetrakis(6-diazo-5,6-dihydro-5-oxonaphthalene-1-sulphonate)

Bis[6-diazo-5,6-dihydro-5-oxo-1-naphthalenesulfonic acid]methylenebis(3-hydroxy-5-methyl-4,1-phenylene) ester