COC(=O)c1c(N2C(=O)[C@@H]3[C@@H]4CCCN4[C@@]4(C(=O)Nc5c4ccc(C)c5C)[C@@H]3C2=O)sc(C)c1C
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?