O=C(O)c1ccc(NC2=C/C(=N/S(=O)(=O)c3ccccc3)c3ccccc3C2=O)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?