Using CC(C)=O, BrC12CC3CC(CC(C3)C1=C1C3CC4CC(C3)CC1C4)C2 to produce OC12CC3CC(CC(C3)C1=C1C3CC4CC(C3)CC1C4)C2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.