O=C(Nc1ccc(-c2ccc3cn[nH]c3c2)cc1)Nc1cccc(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?