Cc1ccc(Nc2nnc(C3C(=O)N(C)C4(C)CC3c3cc(Br)ccc3O4)s2)cc1
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?