Using COC(=O)CN1C(=O)[C@@H](NC(=O)CCc2ccccc2)CNc2ccccc21 to produce O=C(O)CN1C(=O)[C@@H](NC(=O)CCc2ccccc2)CNc2ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.