C[C@@H]1COC(=O)[C@H](NC(=O)OCC2c3ccccc3-c3ccccc32)C/C=C\C[C@@H](CC(=O)N[C@@H](CO)Cc2ccccc2)C(=O)N1
An acid's negative base-10 logarithmic dissociation constant (pKa) follows directly from its underlying thermodynamics; the negative pKa is directly proportional to its standard Gibbs free energy change. What is the negative pKa value of this molecule?