COC(=O)Nc1nc2cc(Oc3ccc(NC(=O)Nc4cccc(C(=O)O)c4)cc3)ccc2[nH]1.Cl
An acid's negative base-10 logarithmic dissociation constant (pka) follows directly from its underlying thermodynamics; pKa is directly proportional to its standard Gibbs free energy change. What is the pka value of this molecule?