COc1ccc(NC(=O)N(C)C[C@H]2Oc3ccc(NC(=O)Nc4c(C)noc4C)cc3C(=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?