CCOc1ccc2nc(N3CCCC(C(=O)Nc4cc(Cl)c(OC)cc4OC)C3)sc2c1
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?