∀ {C : Type u} [inst : CategoryTheory.Category.{v, u} C] [inst_1 : CategoryTheory.MonoidalCategory C] (X Y : C)
  [inst_2 : CategoryTheory.MonoidalCoherence X Y],
  CategoryTheory.MonoidalCoherence.iso =
    CategoryTheory.MonoidalCategoryStruct.rightUnitor X ≪≫ CategoryTheory.MonoidalCoherence.iso