Using Nc1ccc2nc(-c3ccc4c(c3)OCO4)ncc2c1, ClC(Cl)Cl to produce Nc1ccc2nc(-c3ccc4c(c3)OCCO4)ncc2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.