CCOc1cc(/C=C2/S/C(=N/c3ccc4ccccc4c3)NC2=O)cc(Cl)c1OCC(=O)O
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?