O=C(Nc1n[nH]c2ccc(-c3cn(Cc4ccccc4)nn3)cc12)c1cc(F)ccc1F
The negative base-10 logarithmic of dissociation constant (pKa) for an acid is a direct consequence of the underlying thermodynamics of the dissociation reaction; the negative pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the negative pKa value of this molecule?