COc1ccc(S(=O)(=O)N(C)C[C@@H]2Oc3c(NC(=O)c4nc5ccccc5s4)cccc3C(=O)N([C@@H](C)CO)C[C@H]2C)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?