Using O=C(O)c1c(Sc2cccc(Br)c2)c2ccc(Cl)cc2n1Cc1ccccc1 to produce Clc1ccc2c(Sc3cccc(Br)c3)cn(Cc3ccccc3)c2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.