CCc1ccc(N2C(=O)Nc3ccc(Br)cc3C2(O)C(=O)NCCN(C)C)cc1
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?