Using CC(=O)c1ccc(Cn2c(C(C)=O)c(-c3ccccc3)c3cc(Br)ccc3c2=O)cc1, C[Mg]Br to produce CC(=O)c1c(-c2ccccc2)c2cc(Br)ccc2c(=O)n1Cc1ccc(C(C)(C)O)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.