CCCC(C(=O)O)N1C(=O)/C(=C2\C(=O)N(C)c3ccccc32)SC1=S
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?