Using C[Si](C)(C)CCOCn1c2cnc(Br)cc2c2cc(I)cnc21 to produce C[Si](C)(C)CCOCn1c2cnc(Br)cc2c2cccnc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.