The molecule is an organic sodium salt that is the trisodium salt of 4-hydroxy-7-[({5-hydroxy-6-[(3-methoxyphenyl)diazenyl]-7-sulfonaphthalen-2-yl}carbamoyl)amino]-3-[(6-sulfonaphthalen-2-yl)diazenyl]naphthalene-2-sulfonic acid. A direct cotton dye that is also capable of hydrogen bonding to amyloid and giving a dark enough red colour to be useful in diagnostic histology. It has a role as a histological dye. It contains a benzo scarlet 4BNS(3-).
trisodium;4-hydroxy-7-[[5-hydroxy-7-sulfonato-6-[(6-sulfonatonaphthalen-2-yl)diazenyl]naphthalen-2-yl]carbamoylamino]-3-[(3-methoxyphenyl)diazenyl]naphthalene-2-sulfonate