CC(=O)c1cccc(Nc2nc3ccc(Cl)cc3c3[nH]c4ccccc4c23)c1
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?