Using COC(=O)c1cn(COCC[Si](C)(C)C)c(Br)n1, CN(C)C=O to produce COC(=O)c1cn(COCC[Si](C)(C)C)c(C=O)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.