∀ {C : Type u} [inst : CategoryTheory.Category.{v, u} C] [inst_1 : CategoryTheory.MonoidalCategory C]
  [inst_2 : CategoryTheory.BraidedCategory C] (X Y Z : C),
  CategoryTheory.CategoryStruct.comp (CategoryTheory.MonoidalCategoryStruct.associator Y Z X).inv
      (CategoryTheory.CategoryStruct.comp (β_ X (CategoryTheory.MonoidalCategoryStruct.tensorObj Y Z)).inv
        (CategoryTheory.MonoidalCategoryStruct.associator X Y Z).inv) =
    CategoryTheory.CategoryStruct.comp (CategoryTheory.MonoidalCategoryStruct.whiskerLeft Y (β_ X Z).inv)
      (CategoryTheory.CategoryStruct.comp (CategoryTheory.MonoidalCategoryStruct.associator Y X Z).inv
        (CategoryTheory.MonoidalCategoryStruct.whiskerRight (β_ X Y).inv Z))