methylenedinaphthalene-1,2-diyl bis(6-diazo-5,6-dihydro-5-oxonaphthalene-1-sulphonate)

1-Naphthalenesulfonic acid, 6-diazo-5,6-dihydro-5-oxo-, methylenedi-1,2-naphthalenediyl ester

Bis(6-diazo-5,6-dihydro-5-oxo-1-naphthalenesulfonic acid)methylenedinaphthalene-1,2-diyl ester