Using Br[Mg]c1ccccc1, CCCCc1nc(=O)c2cc(C(C)=O)ccc2[nH]1 to produce CCCCc1nc(=O)c2cc(C(C)(O)c3ccccc3)ccc2[nH]1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.