Cc1cc(C)cc(NS(=O)(=O)c2ccc3[nH]cc(C(=O)N(C)Cc4ccccc4)c(=O)c3c2)c1
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?