CNc1c([N+](=O)[O-])nn(-c2ccc3c(c2)OCCO3)[n+]1[O-]
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?