Cn1cc(-c2cnn3c(N)c(-c4ccc(NC(=O)Nc5cccc(C(F)(F)F)c5)cc4)cnc23)cn1
The negative base-10 logarithmic of dissociation constant (pka) for an acid is a direct consequence of the underlying thermodynamics of the dissociation reaction; the pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the pka value of this molecule?