CC(=O)Nc1ccccc1-c1nc2ccccc2n(CC(=O)Nc2ccc(C)c(Cl)c2)c1=O
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?