Using FC(F)(F)C(CCBr)C(F)(F)F, CCOC(=O)c1c(C)nc2c(O)cc(C)cn12 to produce CCOC(=O)c1c(C)nc2c(OCCC(C(F)(F)F)C(F)(F)F)cc(C)cn12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.