COc1ccccc1C(CNC(=O)c1cccc(S(=O)(=O)Nc2ccc(C)cc2)c1)N(C)C
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?