CO[C@@H]1COC(=O)[C@H](C)NC(=O)C/C=C\[C@@H](C)[C@@H](NS(=O)(=O)c2ccc(C)cc2)COC(=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?