Cc1ccccc1NC(=O)c1sc2nc(-c3cc4ccccc4oc3=O)[nH]c(=O)c2c1C
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?