CC(=O)Nc1ccc(-c2csc(NC(=O)C3CCN(S(=O)(=O)c4cccs4)CC3)n2)cc1
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?