| Synonym | Direct red 2, Benzopurpurin 4B, Benzopurpurine 4B, Chrome leather red 4B, CI 23500, CI direct red 2 Cotton red 4B, Diacotton benzopurpurine 4B, Diamine purpurine 4B, Diaphtamine purpurine, Diazamine purpurine 4B Diazine red 4B, Diazol purpurine 4B, 3,3-((3,3-Dimethyl (1,1-biphenyl)-4,4-diyl) bis (azo)) bis (4-amino-1-naphthalenesulfonic acid), disodium salt, Diphenyl red 4B, Direct red 4B Disodium o-tolidinediazobis (1-naphthylamine-4-sulfonate), Ditolylbis (azonaphthionic acid), Eclipse red, Fast scarlet, Paper red 4B Phenamine purpurine 4B, Purpurin 4B, Purpurine 4B, Tertrodirect red 4B |
