Cc1ccc(S(=O)(=O)N2CCN(C(=O)c3cc(-c4ccc(Br)cc4)n[nH]3)CC2)c(C)c1
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?