Using COC(=O)[C@@H](NC(=O)[C@@H](NC(=O)CC1CCC(C)=CC(Cc2ccccc2)C1=O)C(C)C)C(C)C to produce COC(=O)[C@@H](NC(=O)[C@@H](NC(=O)CC1CCC(C)=CC(Cc2ccccc2)C1O)C(C)C)C(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.