Using OB(O)c1ccc(Cl)cc1Cl, CCCN(CCC)c1c(SC)nc2c(Br)cc(C)cn12 to produce CCCN(CCC)c1c(SC)nc2c(-c3ccc(Cl)cc3Cl)cc(C)cn12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.