Using Cc1nn(-c2ccccc2)c(Sc2cc(Cl)cc(Cl)c2)c1C=O to produce Cc1nn(-c2ccccc2)c(Sc2cc(Cl)cc(Cl)c2)c1CO, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.