CS(=O)(=O)N1CCc2cc(S(=O)(=O)NCCNS(=O)(=O)c3ccc4c(c3)CCN4S(C)(=O)=O)ccc21
An acid's negative base-10 logarithmic dissociation constant (pKa) follows directly from its underlying thermodynamics; the negative pKa is directly proportional to its standard Gibbs free energy change. What is the negative pKa value of this molecule?