O=C(NCC(c1ccc2c(c1)OCO2)N1CCOCC1)C(=O)Nc1ccc(F)cc1F
An acid's negative base-10 logarithmic dissociation constant (pKa) follows directly from its underlying thermodynamics; the negative pKa is directly proportional to its standard Gibbs free energy change. What is the negative pKa value of this molecule?