COc1ccccc1N1CCN(C(=O)CNC(=O)c2cn(-c3ccccc3OC)c(=O)c3ccccc23)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?