Using CC(C)OC(=O)C1CCn2c(C(=O)c3ccccc3)cc(Br)c21 to produce O=C(c1ccccc1)c1cc(Br)c2n1CCC2C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.