Using O=C1CCC(=O)N1Br, CCOC(=O)C(CCc1cc[nH]c1C(=O)c1ccccc1)C(=O)OCC to produce CCOC(=O)C(Br)(CCc1cc[nH]c1C(=O)c1ccccc1)C(=O)OCC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.