CCOc1ccc(CCNC(=O)COC(=O)CNC(=O)c2ccc(Br)o2)cc1OCC
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?