Using COC(=O)C(Cc1ccc(-c2cccc(F)c2F)nc1)NC(=O)OC(C)(C)C to produce CC(C)(C)OC(=O)NC(Cc1ccc(-c2cccc(F)c2F)nc1)C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.