Using Cc1c(Cn2c(C)nc3c(Br)cc(N4CCOCC4)cc32)cccc1C(F)(F)F, CB1OB(C)OB(C)O1 to produce Cc1c(Cn2c(C)nc3c(C)cc(N4CCOCC4)cc32)cccc1C(F)(F)F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.