[N-]=[N+]=NC(c1cn(C2CC(O)C(CO)O2)c(=O)[nH]c1=O)C(Br)I
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?