Using COC(=O)[C@@H](C)N(CC(C)CNC(=O)OC(C)(C)C)C(=O)OCc1ccccc1 to produce COC(=O)[C@@H](C)N(CC(C)CN)C(=O)OCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.