CCc1ccc(/C=N/NC(=O)c2cc(-c3cccc([N+](=O)[O-])c3)[nH]n2)cc1
An acid's negative base-10 logarithmic dissociation constant (pka) follows directly from its underlying thermodynamics; pKa is directly proportional to its standard Gibbs free energy change. What is the pka value of this molecule?