Cc1ccc(/C=C2/SC(=S)N(CCCC(=O)Nc3ccc(O)cc3)C2=O)cc1
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?