COc1ccc2c(c1OC)C(=O)OC2Nc1nc(-c2cc3cc([N+](=O)[O-])ccc3oc2=O)cs1
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?