Using C[Si](C)(C)CCOCn1nc(C=Cc2ccccc2)c2ccc(I)cc21, OB(O)c1ccccc1 to produce C[Si](C)(C)CCOCn1nc(C=Cc2ccccc2)c2ccc(-c3ccccc3)cc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.