Using Cc1noc(=O)c2ccc(NC(=O)C(=O)CC(C)(C)c3ccccc3)cc12, C[Mg]Br to produce Cc1noc(=O)c2ccc(NC(=O)C(C)(O)CC(C)(C)c3ccccc3)cc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.