Using CN(C)c1ccc(-c2cnc3c(ccn3COCC[Si](C)(C)C)c2)cc1, [Br-] to produce CN(C)c1ccc(-c2cnc3c(c2)c(Br)cn3COCC[Si](C)(C)C)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.