Using CCOC(=O)[C@@]1(F)[C@@H]2C[C@@H](OCc3ccc(Cl)c(Cl)c3)[C@@](N)(C(=O)OC(C)CC)[C@@H]21 to produce CCC(C)OC(=O)[C@@]1(N)[C@H]2[C@@H](C[C@H]1OCc1ccc(Cl)c(Cl)c1)[C@]2(F)C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.