COc1ccc(Sc2ccc(/C=C3\C(=O)NN(c4ccccc4)C3=O)o2)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?