O=C(O)CC/C(=C\c1ccc(N2CCCC2)c([N+](=O)[O-])c1)c1nc2ccccc2s1
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 negative pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the negative pKa value of this molecule?