CCOc1cc(NC(=O)c2ccccc2[N+](=O)[O-])c(OCC)cc1NC(=O)CC(C)C
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?