Cc1c(Cl)cnc(NC(=O)COC(=O)c2ccc([N+](=O)[O-])s2)c1Cl
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?