Using O=C(OCc1ccc(F)cc1F)c1cc(Br)c(CN2CCOCC2)cc1OCc1ccc(F)cc1F to produce O=C(O)c1cc(Br)c(CN2CCOCC2)cc1OCc1ccc(F)cc1F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.