O=C(CN1C(=O)NC2(CCc3ccccc32)C1=O)c1ccc(F)c(F)c1
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?