CC(C)(C)c1cc(C=NNC(=O)C[n+]2ccccc2)cc(C(C)(C)C)c1O.[Cl-]
The negative base-10 logarithmic of dissociation constant (pka) for an acid is a direct consequence of the underlying thermodynamics of the dissociation reaction; the pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the pka value of this molecule?