N#CC(/C(CCC(=O)Nc1ccc(Cl)cc1)=N/NC(=O)c1cc2ccccc2cc1O)c1ccccc1
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?