C[C@@H]1Nc2cc(NC(=O)OCCF)nc(N)c2N=C1c1ccccc1.ClC(Cl)Cl
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?