C=CCN1C(=O)c2ccc(C(=O)N(CC)CC(=O)Nc3ccc(OC)cc3)cc2C1=O
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?