COc1cc(-c2oc(/C=N/c3ccccc3)c([N+](=O)[O-])c2-c2ccc(O)c(OC)c2)ccc1O
An acid's negative base-10 logarithmic dissociation constant (pKa) follows directly from its underlying thermodynamics; the negative pKa is directly proportional to its standard Gibbs free energy change. What is the negative pKa value of this molecule?