Using Cc1nn(C)c2c1C(c1ccc(Cl)cc1Cl)SC(C)(C)CN2, CC(=O)OC(C)=O to produce Cc1nn(C)c2c1C(c1ccc(Cl)cc1Cl)SC(C)(C)CN2C=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.