Using CN(c1cnc(Br)cn1)[C@@H]1CCN(c2ncnc3c2ccn3COCC[Si](C)(C)C)C1 to produce CN(c1cnccn1)[C@@H]1CCN(c2ncnc3c2ccn3COCC[Si](C)(C)C)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.