Using COS(=O)(=O)OC, O=C1CCC2(CCC(=O)c3ccccc32)C(=O)N1 to produce CN1C(=O)CCC2(CCC(=O)c3ccccc32)C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.