Using COC(=O)[C@@H](O)Cc1ccccc1, Oc1c(Br)cc(-c2c3ccccc3c(Cl)c3sc4ccccc4c23)cc1Br to produce O=C(O)[C@@H](Cc1ccccc1)Oc1c(Br)cc(-c2c3ccccc3c(Cl)c3sc4ccccc4c23)cc1Br, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.