Using Br[Mg]C1CC1, C=C(C)c1cccc2c1CCN1C(=O)CN=C(n3cnc([C@@H](C)OC)c3)C=C21 to produce O=C1CN=C(n2cnc(C(O)C3CC3)c2)C=C2c3cccc(C4CC4)c3CCN12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.