Using Sc1ccccc1, O=C1OC(=O)c2c(Cl)c(Cl)c(Cl)c(Cl)c21 to produce O=C1OC(=O)c2c(Sc3ccccc3)c(Sc3ccccc3)c(Sc3ccccc3)c(Sc3ccccc3)c21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.