SMILES: C1=CC=C2C(=C1)C(=O)C3=C(C2=O)C(=C(C(=C3N)O)S(=O)(=O)[O-])O
Description: The molecule is an organosulfonate oxoanion that is the conjugate base of nuclear fast red free acid, obtained by deprotonation of the sulfo group. It is a conjugate base of a nuclear fast red free acid.