Cc1cc(NC(=O)C2CCN(S(=O)(=O)c3ccc(Br)s3)CC2)ccc1Br
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?