Using C[Mg]Br, COC(=O)c1c(-c2cccc(C=O)c2)c2cc(Cl)ccc2c(=O)n1Cc1ccc(S(C)(=O)=O)cc1 to produce COC(=O)c1c(-c2cccc(C(C)O)c2)c2cc(Cl)ccc2c(=O)n1Cc1ccc(S(C)(=O)=O)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.