Using FCCBr, CCN1CCN(C(=O)c2cn(CC3CCCCC3)c3c(O)cccc23)CC1 to produce CCN1CCN(C(=O)c2cn(CC3CCCCC3)c3c(OCCF)cccc23)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.