Using C=CCBr, C=CC(N[S@@](=O)C(C)(C)C)c1cc([N+](=O)[O-])ccc1SC1CC1 to produce C=CCN(C(C=C)c1cc([N+](=O)[O-])ccc1SC1CC1)[S@@](=O)C(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.