Using COCCCC[C@@](O)(c1cccc(Br)c1)[C@@H]1CCCN(C(=O)OC(C)(C)C)C1, O=C=O to produce COCCCC[C@@](O)(c1cccc(C(=O)O)c1)[C@@H]1CCCN(C(=O)OC(C)(C)C)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.