Using COC(=O)C=Cc1c(-c2ccccc2)c2cc(Br)ccc2c(=O)n1Cc1ccc2c(c1)OCO2 to produce COC(=O)CCc1c(-c2ccccc2)c2ccccc2c(=O)n1Cc1ccc2c(c1)OCO2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.