Using C[Si](C)(C)CCOCn1ncc2cc(Br)cc(CBr)c21, CC(=O)[O-] to produce CC(=O)OCc1cc(Br)cc2cnn(COCC[Si](C)(C)C)c12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.