Using COC(=O)C1CN(c2nnc(Cl)c3ccccc23)CCN1C(=O)OC(C)(C)C to produce COC(=O)C1CN(c2nnc(Cl)c3ccccc23)CCN1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.