Using COC(=O)C(C)(C)COC(=O)N1C[C@H](CN(C(=O)OC(C)(C)C)[C@H](C)c2cccc3ccccc23)[C@@H](c2ccccc2)C1 to produce COC(=O)C(C)(C)COC(=O)N1C[C@H](CN[C@H](C)c2cccc3ccccc23)[C@@H](c2ccccc2)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.