Using O=C1CCC(=O)N1Br, CCOC(=O)c1c(C)ccc(=O)n1Cc1ccccc1 to produce CCOC(=O)c1c(CBr)ccc(=O)n1Cc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.