O=C(C1=NN[C@@H]2C(=O)N(c3ccccc3C(F)(F)F)C(=O)[C@H]12)c1cnccn1
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?