Using COc1cc2c(Oc3ccc4[nH]c(C)cc4c3)ncnc2cc1O, ClCCCBr to produce COc1cc2c(Oc3ccc4[nH]c(C)cc4c3)ncnc2cc1OCCCCl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.