C#CCN1C(=O)S/C(=C\c2ccc(-c3cccc(C(=O)O)c3C)o2)C1=O
An acid's negative base-10 logarithmic dissociation constant (pka) follows directly from its underlying thermodynamics; pKa is directly proportional to its standard Gibbs free energy change. What is the pka value of this molecule?