COc1ccc(C2Nc3ccccc3C(=O)N2c2ccc(F)cc2)cc1CSc1ccccn1
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?