Using CNC(=O)[C@H]1Cc2c([nH]c3ccccc23)CN1C(=O)OC(C)(C)C to produce CNC(=O)[C@H]1Cc2c([nH]c3ccccc23)CN1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.