Cc1ccc(S(=O)(=O)N2CCC(C(=O)N[C@H](C(=O)NC3CCS(=O)(=O)C3)C(C)C)CC2)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?