COc1ccc(OC)c(C=NNC(=O)c2cc[n+](Cc3ccccc3)cc2)c1.[Cl-]
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?