Using COc1ccc(CCl)cc1, O=c1cc(CO)n(-c2cccc(Br)c2)cc1O to produce COc1ccc(COc2cn(-c3cccc(Br)c3)c(CO)cc2=O)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.