Using CN(C)C=O, Cc1nc(Cl)c2c(n1)c(Br)c(C)n2COCC[Si](C)(C)C to produce Cc1nc(Cl)c2c(n1)c(C=O)c(C)n2COCC[Si](C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.