Using COC(=O)[C@H]1CC[C@H](CNc2nc(N3CCOCC3)cc(-n3c(C(F)F)nc4ccccc43)n2)CC1 to produce O=C(O)[C@H]1CC[C@H](CNc2nc(N3CCOCC3)cc(-n3c(C(F)F)nc4ccccc43)n2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.