Using CCn1c(COCc2ccccc2)nc(C(C)C)c1Sc1cc(F)cc(F)c1 to produce CCn1c(CO)nc(C(C)C)c1Sc1cc(F)cc(F)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.