SMILES: CC1=C(C(=C(C=C1)O)[O-])[N+](=O)[O-]
Description: The molecule is a phenolate anion resulting from the deprotonation of the hydroxy group that is ortho to the nitro group of 4-methyl-3-nitrocatechol; the major microspecies at pH 7.3. It is a conjugate base of a 4-methyl-3-nitrocatechol.