O=C(CCCn1c(=O)c2ccccc2n(CC(=O)Nc2ccc(F)cc2F)c1=O)NCc1ccccc1Cl
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?