Using COc1cc2nccc(Oc3cc4ccccc4nc3C)c2cc1O, ClCCBr to produce COc1cc2nccc(Oc3cc4ccccc4nc3C)c2cc1OCCCl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.