Using CCOC(=O)C(C1CCCCC1)n1c(-c2ccc(Cl)cc2)nc2ccccc21 to produce OCC(C1CCCCC1)n1c(-c2ccc(Cl)cc2)nc2ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.