Cc1sc2c(c1C)C(O)=C(C(=O)Nc1ccccc1)S(=O)(=O)N2C
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?