Cc1ccc(C(=O)C2=C(O)C(=O)N(c3ncccn3)C2c2cccc(Cl)c2)o1
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?