Using COC(=O)c1cn2c(c(OCc3ccccc3)c1=O)C(=O)N(Cc1cccc(Cl)c1)CC2 to produce O=C(O)c1cn2c(c(OCc3ccccc3)c1=O)C(=O)N(Cc1cccc(Cl)c1)CC2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.