COc1ccc(NC(=O)CC(=O)NNC(Sc2ccccc2)c2cc(/N=N/c3ccc(Br)cc3)ccc2O)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?