Using C=C[Sn](CCCC)(CCCC)CCCC, Cc1cc2ccccc2c(-c2ccc(Cl)cc2)c1I to produce C=Cc1c(C)cc2ccccc2c1-c1ccc(Cl)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.