Cc1cc2c(cc1C)[n+]([O-])c(C(=O)C/C(=N/NC(=O)c1ccccc1O)C(=O)Nc1ccccc1C(C)C)c(C)[n+]2[O-]
An acid's negative base-10 logarithmic dissociation constant (pKa) follows directly from its underlying thermodynamics; the negative pKa is directly proportional to its standard Gibbs free energy change. What is the negative pKa value of this molecule?