COC(=O)[C@H](Cc1ccccc1)NC(=O)NCCN(CCNC(=O)N[C@@H](Cc1ccccc1)C(=O)OC)C(=O)N[C@@H](Cc1ccccc1)C(=O)OC
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 negative pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the negative pKa value of this molecule?