NC(=O)CC[C@@H]1NC(=O)C(Cc2ccc(O)cc2)NC(=O)c2cc([N+](=O)[O-])cc(F)c2NCCC[C@@H](C(N)=O)NC1=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?