COc1ccc(C(=O)Nc2nncs2)cc1S(=O)(=O)N1CC(c2ccccc2)CC1=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?