COc1ccc(S(=O)(=O)c2c(O)nc3cc(C(=O)Nc4ccc(F)cc4)ccc3c2O)cc1
An acid's negative base-10 logarithmic dissociation constant (pka) follows directly from its underlying thermodynamics; pKa is directly proportional to its standard Gibbs free energy change. What is the pka value of this molecule?