Cc1nn(Cc2ccccc2)c(C)c1C(=O)N1CCN(CC(=O)Nc2ccccc2Cl)CC1
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?