Using CCc1nn(Cc2cn[nH]c2)c2cccc(NC(=O)c3cnc4ccccn34)c12, CC(C)(C)[Si](C)(C)OCCBr to produce CCc1nn(Cc2cnn(CCO[Si](C)(C)C(C)(C)C)c2)c2cccc(NC(=O)c3cnc4ccccn34)c12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.