Using O=C1CCC(=O)N1Br, COCOc1nc2c(c(C)nn2C)c2ccccc12 to produce COCOc1nc2c(c(CBr)nn2C)c2ccccc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.