Using COC[C@H]1CN(C(=O)OC(C)(C)C)[C@H](C)CN1C(=O)OCc1ccccc1 to produce COC[C@H]1CN(C(=O)OC(C)(C)C)[C@H](C)CN1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.