SMILES: C1=C(C(=O)NC(=O)C1=O)C2=C(NC(=O)C(=C2)[O-])[O-]
Description: The molecule is an organic anion obtained by selective deprotonation of the hydroxy groups at positions 2 and 2' of nicotine blue; major species at pH 7.3 (according to Marvin v 6.2.0.). It is a conjugate base of a nicotine blue.