O=C(CN(Cc1ccc(F)cc1)C(=O)CCC(=O)Nc1ccccn1)NCc1ccc(F)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?