Synonyms: Benzenesulfonic acid, 2,2'-(1,2-ethenediyl)bis(5-nitro-, reaction products with sodium 4-(2-(4-aminophenyl)diazenyl)benzenesulfonate (1:1), compds. with guanidine N,N'-mixed Ph and tolyl and xylyl derivs.;Benzenesulfonic acid, 2,2'-(1,2-ethenediyl)bis(5-nitro-, reaction products with 4-((4-aminophenyl)azo)benzenesulfonic acid monosodium salt, compds. with N,N'-bis(phenyl, tolyl and xylyl)guanidines;Benzenesulfonic acid, 2,2'-(1,2-ethenediyl)bis(5-nitro-, reaction products with 4-((4-aminophenyl)azo)benzenesulfonic acid monosodium salt, compds. with guanidine N,N'-mixed Ph and tolyl and xylyl derivs.;sodium; 4-(4-aminophenyl)azobenzenesulfonate; guanidine; 5-nitro-2-[(E)-2-(4-nitro-2-sulfo-phenyl)vinyl]benzenesulfonic acid