COc1ccccc1CN1[C@@H](CC(=O)O)c2cc(F)ccc2S1(=O)=O
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?