Using O=C1c2ccccc2C(=O)N1CC(=O)N1Cc2ccccc2Oc2ccc(Cl)cc21 to produce NCC(=O)N1Cc2ccccc2Oc2ccc(Cl)cc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.