Using O=C1CCC(=O)N1Br, Cc1cnc(C)n2c1c(CCCl)c1ccccc12 to produce Cc1c(N2C(=O)CCC2=O)nc(C)n2c1c(CCCl)c1ccccc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.