Using O=C1CCC(=O)N1Br, Cc1c(-c2ccccc2)sc2ccc(Cl)cc12 to produce Clc1ccc2sc(-c3ccccc3)c(CBr)c2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.