Using FC(F)=C(F)CCBr, C[C@H](NC(=O)c1c(F)cccc1F)C(=O)O to produce C[C@H](NC(=O)c1c(F)cccc1F)C(=O)OCCC(F)=C(F)F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.