Using O=C(O)CNC(=O)NC(=O)C(CC1CCCC1)c1ccc(Cl)c(Cl)c1, CO to produce COC(=O)CNC(=O)NC(=O)C(CC1CCCC1)c1ccc(Cl)c(Cl)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.