Cc1ccc(NC(=O)CN2C(=O)S/C(=C/c3ccc(-c4cccc(C(=O)O)c4)o3)C2=O)cc1
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?