CO[C@H]1COC(=O)[C@H](C)NC(=O)[C@@H](C)COC(=O)[C@H]2CCCN2C(=O)C/C=C\[C@H]1C
An acid's negative base-10 logarithmic dissociation constant (pka) follows directly from its underlying thermodynamics; pKa is directly proportional to its standard Gibbs free energy change. What is the pka value of this molecule?