Cc1ccc(C)c(N2CCN(C(=O)C(CC(C)C)NS(=O)(=O)c3ccc4nc(C)sc4c3)CC2)c1
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?