Using C1COCCO1, O=C1Cc2cccc(S(=O)c3ccccc3Cl)c2N1 to produce Nc1c(CC(=O)[O-])cccc1S(=O)c1ccccc1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.