Cc1cc2c(cc1Cl)SSc1cc(Cl)c(C)cc1S(=O)(=O)Nc1nc(N)nn1C(O)n1nc(N)nc1NS2(=O)=O
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?