O=C(Nc1cccc(C(F)(F)F)c1)Nc1nnc([C@@H]2C[C@H](O)[C@@H](CO)O2)s1
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?