CC(C)Nc1ccc(C(CC(N)=O)NC(=O)Cc2ccc(Br)cc2)cc1[N+](=O)[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?