COc1ccc(OC)c(N2C(N)=C(C#N)C(c3ccc(OC)c(O)c3)C3=C2CC(C)(C)CC3=O)c1
The negative base-10 logarithmic of dissociation constant (pka) for an acid is a direct consequence of the underlying thermodynamics of the dissociation reaction; the pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the pka value of this molecule?