Using CN(CC(CC(O)CO)(c1ccc(Cl)c(Cl)c1)N(C)C(=O)OC(C)(C)C)C(=O)CC(F)(F)F to produce CN(CC(CC=O)(c1ccc(Cl)c(Cl)c1)N(C)C(=O)OC(C)(C)C)C(=O)CC(F)(F)F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.