CN(C)C(=O)C(F)(F)C(c1ccccc1Br)C1C(=O)N(C)C(=O)N(C)C1=O
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?