Term Name:	benzo scarlet 4BNS free acid
Synonyms:	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, amyloid red free acid, direct red 72 free acid
Definition:	A naphthalenesulfonic acid that is the free acid form of the dye benzo scarlet 4BNS. The trisodium salt is 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.
Ontology:	ChEBI [CHEBI:87469]  ( EBI )