O=C(CNC(=O)c1ccc2ccccc2c1)OC(C(=O)Nc1cc(C(F)(F)F)ccc1Cl)c1ccccc1
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?