Using BrCc1cc2ccccc2c(-c2ccccc2)n1, CCOC(=O)CC(=O)OCC to produce O=C(O)CCc1cc2ccccc2c(-c2ccccc2)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.