SMILES: C1=CC=C2C(=C1)C=CC(=C2N=NC3=C(C=C(C=C3)N=NC4=CC=C(C=C4)S(=O)(=O)O)S(=O)(=O)O)O
Description: The molecule is an arenesulfonic acid that is m-[(4-sulfophenyl)diazenyl]benzene-1-sulfonic acid carrying a (2-hydroxynaphthalen-1-yl)diazenyl substituent at position 2. The disodium salt is the biological stain 'Biebrich scarlet'. It has a role as a histological dye. It is a member of naphthols, a bis(azo) compound, a member of azobenzenes and an arenesulfonic acid. It is a conjugate acid of a Biebrich scarlet(2-).