Cc1ccc(NC(=O)C(NS(=O)(=O)c2ccc3c(c2)CCC(=O)N3)c2ccccc2)cc1C
An acid's negative base-10 logarithmic dissociation constant (pKa) follows directly from its underlying thermodynamics; the negative pKa is directly proportional to its standard Gibbs free energy change. What is the negative pKa value of this molecule?