Using O=C(O)c1ccc(/C=C/C(c2cc(Cl)c(Cl)c(Cl)c2)C(F)(F)F)cc1Br, C=C[Sn](CCCC)(CCCC)CCCC to produce C=Cc1cc(/C=C/C(c2cc(Cl)c(Cl)c(Cl)c2)C(F)(F)F)ccc1C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.