O=C1NC(=O)[C@@H]2[C@H]1C1c3ccccc3C=CN1[C@@H]2C(=O)c1cccs1
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?