COc1ccc2cc(C#N)c(SCC(=O)NNC(=O)Cc3ccccc3)nc2c1
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?