Using O=CC1CCOCC1, COC1=C(c2c(C)cc(Br)cc2C)C(=O)CC1 to produce COC1=C(c2c(C)cc(Br)cc2C)C(=O)C(C(O)C2CCOCC2)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.