Syonyms Name: C.I. 22311; C.I. 22 311; C.I. Direct Brown 2, disodium salt; C.I. Direct Brown 2; Direct Brown 2; 5-[[4'-[(7-amino-1-hydroxy-3-sulfo-2-naphthyl)azo][1,1'-biphenyl]-4-yl]azo]-2-hydroxybenzoic acid, disodium salt; benzoic acid,5-((4'-((7-amiono-1-hydroxy-3-