Using O=C1CCC(=O)N1Br, C1C2CC3CC1CC(C2)C3=C1C2CC3CC(C2)CC1C3 to produce BrC1C2CC3CC(C2)C(=C2C4CC5CC(C4)CC2C5)C1C3, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.