Using O=C(O)CCl, COC(=O)[C@H](O)[C@@H](Cc1cccc(F)c1)NC(=O)OC(C)(C)C to produce COC(=O)[C@@H](OC(=O)CCl)[C@@H](Cc1cccc(F)c1)NC(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.