SMILES: C1=CC=C(C=C1)N=NC2=C(C3=C(C=C(C=C3C=C2S(=O)(=O)O)S(=O)(=O)O)O)O
Description: The molecule is a naphthalenesulfonic acid that is naphthalene-2,7-disulfonic acid carrying two additional hydroxy substituents at positions 4 and 5 as well as a phenyldiazenyl substituent at position 3. The disodium salt is the biological stain 'acid red 29'. It is a member of azobenzenes, a naphthalenesulfonic acid and a member of naphthalenediols. It is a conjugate acid of a 4,5-dihydroxy-3-(phenyldiazenyl)naphthalene-2,7-disulfonate.