CCCn1c(=O)[nH]c(=O)c2c1nc(-c1cc([N+](=O)[O-])ccc1Cl)n2CCOC
The negative base-10 logarithmic of dissociation constant (pka) for an acid is a direct consequence of the underlying thermodynamics of the dissociation reaction; the pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the pka value of this molecule?