Using COc1ccc2c(c1)C(Cc1ccc(Cl)c(Cl)c1)C(N1CCCC1)CC2 to produce Oc1ccc2c(c1)C(Cc1ccc(Cl)c(Cl)c1)C(N1CCCC1)CC2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.