CN(CC(=O)Nc1ccc(F)c(Cl)c1)S(=O)(=O)c1ccc2c(c1)n(C)c(=O)c(=O)n2C
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?