COc1cccc(-c2ccc3c(N)c(C(=O)Nc4ccc(Cl)cc4F)sc3n2)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?