IUPAC: 4,5-dihydroxy-3-[2-(8-hydroxy-3,6-disulfonaphthalen-1-yl)diazen-1-yl]naphthalene-2,7-disulfonic acid sodium

SMILES: [Na].Oc1cc(cc2cc(c(N=Nc3cc(cc4cc(cc(O)c34)S(O)(=O)=O)S(O)(=O)=O)c(O)c12)S(O)(=O)=O)S(O)(=O)=O |w:11.10|jcExt:v:0:0