O=C(CNCc1ccccn1)Nc1cc(C(F)(F)F)ccc1N1CCOCC1.O=C(O)C(=O)O
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?