Using CS(=O)(=O)OCC1Cc2c(ccc3[nH]c(=O)ccc23)O1 to produce CS(=O)(=O)OCC1Cc2c(ccc3c2CCC(=O)N3)O1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.