CC(=O)N/C(=C\c1ccccc1)C(=O)OCC(=O)NC(C)C12CC3CC(CC(C3)C1)C2
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?