Using O=C1CCC(=O)O1, COc1ccc(-c2c(Cl)c(CN)nc3sc4c(c23)CC[S@](=O)C4)cc1 to produce COc1ccc(-c2c(Cl)c(CN3C(=O)CCC3=O)nc3sc4c(c23)CC[S@](=O)C4)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.