Using C[Si](Cl)(c1ccccc1)c1ccccc1, [Li][Si](C)(c1ccccc1)c1ccccc1 to produce C[Si](C)(C)[Si](C)(c1ccccc1)c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.