Using Clc1cc(Cl)ncn1, Oc1cc(Cl)c2[nH]c(C3CCOC3)nc2c1 to produce Clc1cc(Oc2cc(Cl)c3[nH]c(C4CCOC4)nc3c2)ncn1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.