O=C(CCCn1c(=O)c2ccccc2n(CC(=O)Nc2cccc(C(F)(F)F)c2)c1=O)NCc1ccc2c(c1)OCO2
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?