Using C[Si](C)(C)CCOCn1cc(C(=O)O)c2nc(Br)cnc21, CC(N)c1ncco1 to produce CC(NC(=O)c1cn(COCC[Si](C)(C)C)c2ncc(Br)nc12)c1ncco1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.