Using O=C(c1c[nH]c2ccc(CCS(=O)(=O)c3ccccc3)cc12)[C@H]1CCCN1C(=O)OCc1ccccc1 to produce CN1CCC[C@@H]1C(=O)c1c[nH]c2ccc(CCS(=O)(=O)c3ccccc3)cc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.