SMILES: C(=C/C(=O)[O-])\\C(=C/C(=O)C(=O)[O-])\\[N+](=O)[O-]
Description: The molecule is a dicarboxylic acid dianion obtained by deprotonation of the carboxy groups of 4-nitro-6-oxohepta-2,4-dienedioic acid; major species at pH 7.3. It is a conjugate base of a 4-nitro-6-oxohepta-2,4-dienedioic acid.