Cc1cn(C2CC(/[N+]([O-])=N\Nc3ccc([N+](=O)[O-])cc3)C(CO)O2)c(=O)[nH]c1=O
An acid's negative base-10 logarithmic dissociation constant (pka) follows directly from its underlying thermodynamics; pKa is directly proportional to its standard Gibbs free energy change. What is the pka value of this molecule?