Using C1COCCN1, CNc1nc(-c2cccnc2)nc2ccc(-c3ccc(OCCCl)cc3)cc12 to produce CNc1nc(-c2cccnc2)nc2ccc(-c3ccc(OCCN4CCOCC4)cc3)cc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.