O=c1c(-c2cc(F)cc(F)c2)nc2cnc(Nc3ccccc3)nc2n1C[C@H]1CCCO1
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 pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the pka value of this molecule?