Cc1ccc(C)c(N(CC(=O)Nc2ccccc2C(=O)NCc2ccco2)S(=O)(=O)c2ccccc2)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?