Using C=CCC(CO[Si](c1ccccc1)(c1ccccc1)C(C)(C)C)NS(=O)(=O)c1ccc(C)cc1, C=CCBr to produce C=CCC(CO[Si](c1ccccc1)(c1ccccc1)C(C)(C)C)N(CC=C)S(=O)(=O)c1ccc(C)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.