Using Brc1ccc2c(c1)OCO2, OC12CC3CC(CC(C3)C1)C2 to produce Brc1cc2c(c(C34CC5CC(CC(C5)C3)C4)c1)OCO2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.