COc1ccc(Nc2oc(-c3ccc(COc4cccc(C)c4)o3)nc2C#N)cc1
An acid's negative base-10 logarithmic dissociation constant (pKa) follows directly from its underlying thermodynamics; the negative pKa is directly proportional to its standard Gibbs free energy change. What is the negative pKa value of this molecule?