Using C[Si](C)(C)CCOCn1ccc2c(N3CC[C@@H](Nc4ccc(C#N)cn4)C3)ncnc21, CCBr to produce CCN(c1ccc(C#N)cn1)[C@@H]1CCN(c2ncnc3c2ccn3COCC[Si](C)(C)C)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.