O=C(CSc1ccc2nnc(-c3cccnc3)n2n1)Nc1ccccc1C(F)(F)F
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?