O=C(CNC(=O)c1cccc(-n2cnnn2)c1)Nc1ccc(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?