COc1ccc(C[C@H]2NC(=O)/C=C/C[C@@H]([C@H](C)[C@H]3O[C@@H]3c3ccccc3)OC(=O)[C@H](CC(C)C)OC(=O)[C@H](C)CNC2=O)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 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?