Using C[Sn](C)(C)c1cccnc1, C[Si](C)(C)CCOCn1cnc(Br)c1Br to produce C[Si](C)(C)CCOCn1cnc(Br)c1-c1cccnc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.