CC1(C(=O)N2CC3(CC(c4cccc(NC(=O)COc5ccc(Cl)cc5)c4)=NO3)C[C@@H]2C(N)=O)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?