Using C=CC(=O)OC(C)(C)C, C[Si](C)(C)CCOCn1cc(C#N)nc1C(=O)Nc1ccc(Br)cc1C1=CCCCC1 to produce CC(C)(C)OC(=O)C=Cc1ccc(NC(=O)c2nc(C#N)cn2COCC[Si](C)(C)C)c(C2=CCCCC2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.