NS(=O)(=O)c1ccc2c(c1)C(=NO)c1cc(S(N)(=O)=O)ccc1-2
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?