Using COC(=O)[C@H](Cc1ccccc1)Nc1c(NCc2ccccc2)c(=O)c1=O to produce O=C(O)[C@H](Cc1ccccc1)Nc1c(NCc2ccccc2)c(=O)c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.