∀ (C : Type u_2) [inst : CategoryTheory.Category.{u_1, u_2} C] [inst_1 : CategoryTheory.MonoidalCategory C],
  CategoryTheory.CategoryStruct.comp
      (CategoryTheory.CategoryStruct.id
        ((CategoryTheory.MonoidalOpposite.mopMopEquivalence C).inverse.obj
          (CategoryTheory.MonoidalCategoryStruct.tensorUnit C)))
      (CategoryTheory.CategoryStruct.id (CategoryTheory.MonoidalCategoryStruct.tensorUnit Cᴹᵒᵖᴹᵒᵖ)) =
    CategoryTheory.CategoryStruct.id
      ((CategoryTheory.MonoidalOpposite.mopMopEquivalence C).inverse.obj
        (CategoryTheory.MonoidalCategoryStruct.tensorUnit C))