C/C(CC(=O)Nc1cccc([N+](=O)[O-])c1)=N\NC(=O)CC#N
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?