COC(=O)C1=C(C)N2[C@H](C(=O)O)CO[C@@]2(C)[C@H](C(=O)OC)[C@H]1c1cccc([N+](=O)[O-])c1
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?