COc1ccc(Oc2cccc(C3C4C(=O)N(c5ccc(C)c(Cl)c5)C(=O)C4ON3C(C(N)=O)c3ccccc3)c2)cc1
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?