CCOc1ccc(NC(=O)c2nn(C)c(C(=O)Nc3ccc(OCC)cc3)c2[N+](=O)[O-])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?