Cc1ccc2cccc(S(=O)(=O)Nc3c(C)n(C)n(-c4ccccc4)c3=O)c2n1
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?