Using COC(=O)CCCCn1nc2c(c1-c1ccc(Cl)cc1)CCNCC2 to produce O=C(O)CCCCn1nc2c(c1-c1ccc(Cl)cc1)CCNCC2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.