O=C(CCCNC(=O)/C(=C\c1ccccc1F)NC(=O)c1ccccc1)OCc1ccccc1
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?