CC(C)NS(=O)(=O)c1ccc(NC(=S)NC(=O)c2ccc(-c3ccccc3)cc2)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?