Using COC(=O)CC1Nc2ccc(C(=O)NCc3ncc[nH]3)cc2CN(CCc2ccccc2)C1=O to produce O=C(O)CC1Nc2ccc(C(=O)NCc3ncc[nH]3)cc2CN(CCc2ccccc2)C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.