CC(=O)c1ccc(-c2cnc3c(NC=O)cc(-c4ccc(C(=O)NC5CC5)cc4)cn23)cc1
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?