Using COC(=O)CC1(CC(F)(F)F)CCc2cc(-c3cnc(Nc4cccc(Cl)c4)s3)ccc2C1=O to produce O=C(O)CC1(CC(F)(F)F)CCc2cc(-c3cnc(Nc4cccc(Cl)c4)s3)ccc2C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.