Nc1nc(N)c2cc(CNc3ccc(C(=O)NC(CC(=O)O)C(=O)O)c(Cl)c3)ccc2n1
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?