Using C[Si](C)(C)CCOCCl, Cn1nc(-c2ccc(Br)cc2)[nH]c1=O to produce Cn1nc(-c2ccc(Br)cc2)n(COCC[Si](C)(C)C)c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.