Using CN1CCNCC1, CC(C)(C)OC(=O)N(c1ccc(CBr)c([Si](C)(C)C)c1)[Si](C)(C)C to produce CN1CCN(Cc2ccc(NC(=O)OC(C)(C)C)cc2[Si](C)(C)C)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.