Using CN1CCNCC1, C[Si](C)(C)CCOCn1cnc2ccc(Br)cc21 to produce CN1CCN(c2ccc3ncn(COCC[Si](C)(C)C)c3c2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.