COc1ccc(C2C(C#N)=C(SCC(=O)Nc3ccc(C)cc3)N=C3CC(C)(C)CC(O)=C32)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?