CC(C)c1ccc(NS(=O)(=O)c2ccc3[nH]cc(C(=O)NC4CCCC4)c(=O)c3c2)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?