Using CCOC(=O)CCN1CCN(C2=Nc3ccccc3Sc3ccc(Cl)cc32)CC1 to produce O=C(O)CCN1CCN(C2=Nc3ccccc3Sc3ccc(Cl)cc32)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.