CCOc1ccc(NC(=O)CN2CCN(CC(=O)Nc3cc(OC)cc(OC)c3)CC2)cc1
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?