COC(=O)c1ccc(NC(=O)COc2ccc(C3C(C#N)=C(N)Oc4c3ccc3ccccc43)cc2OC)cc1
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?