Cc1nc(SC2CC(=O)N(c3ccc([N+](=O)[O-])cc3)C2=O)nc2c1CCCC2
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?