Using COC(=O)C=Cc1c(COc2ccc(Cl)cc2)n(C)c2ccccc12 to produce COC(=O)CCc1c(COc2ccc(Cl)cc2)n(C)c2ccccc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.