Using COC1=C(c2c(C)cc(Br)cc2C)C(=O)C(C(O)C2CCOCC2)C1 to produce Cc1cc(Br)cc(C)c1C1C(=O)CC(=CC2CCOCC2)C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.