Using C=CC[Mg]Br, C[C@@H](c1ccc(Br)cc1)N(CCCC(=NS(=O)C(C)(C)C)c1ccccc1)C(=O)OC(C)(C)C to produce C=CCC(CCCN(C(=O)OC(C)(C)C)[C@@H](C)c1ccc(Br)cc1)(NS(=O)C(C)(C)C)c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.