O=C(O)c1cccc(NC(=O)c2cn(-c3ccccc3)nc2-c2cc3ccccc3o2)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?