CCOC(=O)c1c(NC(=O)c2ccc(N3CCOCC3)c([N+](=O)[O-])c2)sc(C)c1C
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?