CCOC(=O)CCNC(=O)Nc1ccc2nc(C)n(Cc3ccccc3Cl)c(=O)c2c1
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?