O=C(CN1C(=O)N/C(=C\c2ccccc2OCc2ccc(C(=O)O)cc2)C1=O)Nc1ccc(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?