Using O=C1CCC(=O)N1Br, CCOC(=O)NC1CCCCn2c1nc(-c1ccncn1)cc2=O to produce CCOC(=O)NC1CCCCn2c1nc(-c1ccncn1)c(Br)c2=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.