Using COC(=O)[C@H](Cc1cn(CC(=O)OC(C)(C)C)c2ccccc12)NC(=O)OC(C)(C)C to produce CC(C)(C)OC(=O)Cn1cc(C[C@H](NC(=O)OC(C)(C)C)C(=O)O)c2ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.