O=C(Nc1c(Cl)cc(Cl)cc1C(=O)NCCN1CCOCC1)c1cccc([N+](=O)[O-])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?