Using CCOCC, CC12CC3CC(C)(C1)CC(Br)(C3)C2 to produce CC12CC3CC(C)(C1)CC(C14CC5CC(C)(CC(C)(C5)C1)C4)(C3)C2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.