O=C(Cn1c(=O)n(Cc2nc(-c3ccccc3)no2)c(=O)c2ccccc21)Nc1cccc(C(F)(F)F)c1
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?