17809-07-3 2-Naphthalenecarboxamide, 4-((2,4-dinitrophenyl)azo)-N-(2-ethoxyphenyl)-3-hydroxy- 4-((2,4-Dinitrophenyl)azo)-N-(2-ethoxyphenyl)-3-hydroxynaphthalene-2-carboxamide EINECS 241-778-3