Using ClCCl, COc1cc2nc(-c3cc(OC)c(OC)c(OC)c3)nc(O)c2cc1OC to produce COc1cc2nc(-c3cc(OC)c(OC)c(OC)c3)nc(Cl)c2cc1OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.