CC1=NN(c2nc(-c3ccc(C)cc3)cs2)C(=O)C1N=Nc1cccc(O)c1
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?