Using Cc1ncn(-c2ccc(Nc3nc4n(n3)CCC(=O)CC4c3ccc(F)cc3)cc2F)n1, C[Mg]Br to produce Cc1ncn(-c2ccc(Nc3nc4n(n3)CC[C@@](C)(O)C[C@@H]4c3ccc(F)cc3)cc2F)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.