Using Fc1cc(CC[C@H]2CC[C@H](C3CC[SiH](Cl)CC3)CC2)cc(F)c1F, CCCBr to produce CCC[Si@H]1CC[C@H]([C@H]2CC[C@H](CCc3cc(F)c(F)c(F)c3)CC2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.