Using O=C([O-])[O-], Cc1cc(Br)cc(C)c1C1C(=O)C2C3CCC(O3)C2C1=O to produce COC1=C(c2c(C)cc(Br)cc2C)C(=O)C2C3CCC(O3)C12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.