O=C(CCN1C(=O)[C@H]2CC=CC[C@H]2C1=O)NCc1nc(-c2ccc(Cl)cc2)no1
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?