Using O=c1[nH]c(Cl)c(-c2ccccc2)c(=O)n1Cc1ccccc1, ClCCCBr to produce O=c1c(-c2ccccc2)c(Cl)n(CCCCl)c(=O)n1Cc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.