Using N[C@H](Cc1ccc(-c2cc(Cl)ccc2F)cc1)C[C@@H](O)C(=O)OCC(F)(F)C(F)(F)F, O=C(O)c1cn(O)nn1 to produce O=C(N[C@H](Cc1ccc(-c2cc(Cl)ccc2F)cc1)C[C@@H](O)C(=O)O)c1cn(O)nn1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.