COc1ccccc1N1CCN(C(CNC(=O)C(=O)NCc2ccc(F)cc2)c2cccnc2)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?