Cc1ccc2nc(NC(=O)C3CCN(S(=O)(=O)c4c[nH]cn4)CC3)sc2c1
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?