COc1ccc2c(c1)[n+]([O-])c(C(=O)CC(=O)C(=O)Nc1cccc(C)c1C)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?