COc1ccc(-n2c3c(cc(C(=O)NNc4ccccc4C)c2=O)C(=O)CC(C)(C)C3)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?