Cc1ccc(S(=O)(=O)NCc2ccc(/C=C(/C#N)C(=O)NCc3ccccc3)o2)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?