C/C=C1\NC(=O)[C@H](C)NC(=O)[C@@H](NC(=O)[C@H](Cc2ccc(O)cc2)NC(=O)[C@@H](NC(=O)/C(C)=C/C)C(C)C)[C@@H](C)OC(=O)[C@H](CC(C)C)NC(=O)[C@@H](CCC(=O)O)NC1=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 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?