COc1ccccc1NS(=O)(=O)c1cccc(C(=O)NNC(=O)C(NC(N)=O)C(C)C)c1
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?