∀ (C : Type u_1) [inst : CategoryTheory.Category.{u_2, u_1} C] [inst_1 : CategoryTheory.HasShift C ℤ],
  CategoryTheory.Pretriangulated.Opposite.OpOpCommShift.iso C 0 =
    CategoryTheory.Functor.CommShift.isoZero (CategoryTheory.opOp C) ℤ