Using CC(=O)[C@H]1CC[C@H]2[C@@H]3[C@@H](C)C[C@H]4NC(=O)C=C[C@]4(C)[C@H]3CC[C@]12C, C[Mg]Br to produce C[C@H]1C[C@H]2NC(=O)C=C[C@]2(C)[C@H]2CC[C@]3(C)[C@@H](C(C)(C)O)CC[C@H]3[C@H]12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.