Using C[Mg]I, CN(CC(=O)C(c1ccccc1)c1ccccc1)Cc1ccccc1 to produce CN(Cc1ccccc1)CC(C)(O)C(c1ccccc1)c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.