Using CCOC(=O)[C@@]1(F)[C@@H]2C[C@@H](N)[C@@](NC(=O)OC(C)(C)C)(C(=O)OCC)[C@@H]21, Clc1ccc(CBr)cc1Cl to produce CCOC(=O)[C@@]1(F)[C@@H]2C[C@@H](NCc3ccc(Cl)c(Cl)c3)[C@@](NC(=O)OC(C)(C)C)(C(=O)OCC)[C@@H]21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.