2-Diazo-1-Naphthoquinone-5-SulfonicAcidEsters

thiodi-1,4-phenylene bis(6-diazo-5,6-dihydro-5-oxonaphthalene-1-sulphonate)

Bis[6-diazo-5,6-dihydro-5-oxo-1-naphthalenesulfonic acid]thiodi-4,1-phenylene ester