O=C(NCc1ccco1)c1ccc(Cl)c(S(=O)(=O)N2CCc3ccccc32)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?