CN1C(=O)[C@H](NC(=O)c2ccccc2I)N=C(c2ccccc2F)c2ccccc21
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?