CCc1ccccc1N(C)C(=O)Cn1cnc2sc(C)c(S(=O)(=O)N3CCN(c4ncccn4)CC3)c2c1=O
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?