C=CCN(CC=C)C(=O)CN1C(=O)NC(C)(c2ccc3cc(OC)ccc3c2)C1=O
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?