Oc1ccc(/C=N/N=c2\[nH][nH]/c(=N\N=C\c3ccc(O)cc3O)c3ccccc23)c(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 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?