Using CC(C)(C)OC(=O)NCC(=O)N1CCc2c(Br)cccc2C1CC(=O)O to produce O=C1C=C2c3cccc(Br)c3CCN2C(=O)CN1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.