COc1ccc(/C=C/C(=O)OCC(=O)N2CC(=O)Nc3ccccc32)cc1S(=O)(=O)N1CCOCC1
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?