Cn1nc([N+](=O)[O-])c(C(C#N)c2nc3ccccc3n2C)c(Cl)c1=O
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?