Using CCOC(=O)C(C)Oc1cc(N2C(=O)C3=C(CCCC3)C2=O)ccc1Br to produce CC(Oc1cc(N2C(=O)C3=C(CCCC3)C2=O)ccc1Br)C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.