Cc1noc(NS(=O)(=O)c2ccc(NC(=O)C(CC(C)C)N3C(=O)c4ccccc4C3=O)cc2)c1C
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 pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the pka value of this molecule?