SMILES: C1=CC=C(C=C1)N=NC2=C(C3=C(C(=C(C=C3C=C2S(=O)(=O)O)S(=O)(=O)O)N=NC4=CC=C(C=C4)[N+](=O)[O-])N)O
Description: The molecule is a bis(azo) compound that is naphthalene-2,7-disulfonic acid in which the hydrogens at positions 3, 4, 5, and 6 are replaced by (p-nitrophenyl)azo, amino, hydroxy, and phenylazo groups, respectively. A biological stain, it can be used interchangeably with its disodium salt, Amido Black 10B. It has a role as a histological dye. It is a bis(azo) compound, a C-nitro compound, a member of naphthols and an aminonaphthalenesulfonic acid. It is a conjugate acid of a 4-amino-5-hydroxy-3-[(p-nitrophenyl)azo]-6-(phenylazo)-naphthalene-2,7-disulfonate.