CCOC(=O)c1sc(N2C(=O)C(O)=C(C(=O)c3ccc(C)o3)C2c2cccc([N+](=O)[O-])c2)nc1C
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?