O=C(Nc1cccnc1)C1(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C1(F)F
An acid's negative base-10 logarithmic dissociation constant (pka) follows directly from its underlying thermodynamics; pKa is directly proportional to its standard Gibbs free energy change. What is the pka value of this molecule?