Using CCB(CC)c1ccncc1, CC(=O)c1c(C)c(Br)n(COCC[Si](C)(C)C)c1C to produce CC(=O)c1c(C)c(-c2ccncc2)n(COCC[Si](C)(C)C)c1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.