CCOC(=O)c1c(C)[nH]c(C)c1S(=O)(=O)N(C)CC(=O)Nc1ccc(C)cc1Br
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?