Cc1ccc(S(=O)(=O)Nn2c(-c3ccccc3)c(C#N)c(-c3ccc(Cl)cc3)c(C#N)c2=O)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?