∀ (C : Type u_4) (D : Type u_2) [inst : CategoryTheory.Category.{u_3, u_4} C]
  [inst_1 : CategoryTheory.MonoidalCategory C] [inst_2 : CategoryTheory.Category.{u_1, u_2} D]
  [inst_3 : CategoryTheory.MonoidalCategory.MonoidalLeftAction Cᵒᵖ Dᵒᵖ] (x x_1 x_2 : C) (x_3 : D),
  CategoryTheory.CategoryStruct.comp
      (CategoryTheory.MonoidalCategory.MonoidalLeftActionStruct.actionHomLeft
          (CategoryTheory.MonoidalCategoryStruct.associator x x_1 x_2).hom.op (Opposite.op x_3)).unop
      (CategoryTheory.CategoryStruct.comp
        (CategoryTheory.MonoidalCategory.MonoidalLeftActionStruct.actionAssocIso (Opposite.op x)
                (Opposite.op (CategoryTheory.MonoidalCategoryStruct.tensorObj x_1 x_2)) (Opposite.op x_3)).symm.unop.hom
        (CategoryTheory.MonoidalCategory.MonoidalLeftActionStruct.actionHomRight (Opposite.op x)
            (CategoryTheory.MonoidalCategory.MonoidalLeftActionStruct.actionAssocIso (Opposite.op x_1) (Opposite.op x_2)
                      (Opposite.op x_3)).symm.unop.hom.op).unop) =
    CategoryTheory.CategoryStruct.comp
      (CategoryTheory.MonoidalCategory.MonoidalLeftActionStruct.actionAssocIso
              (Opposite.op (CategoryTheory.MonoidalCategoryStruct.tensorObj x x_1)) (Opposite.op x_2)
              (Opposite.op x_3)).symm.unop.hom
      (CategoryTheory.MonoidalCategory.MonoidalLeftActionStruct.actionAssocIso (Opposite.op x) (Opposite.op x_1)
              (Opposite.op
                (Opposite.unop
                  (CategoryTheory.MonoidalCategory.MonoidalLeftActionStruct.actionObj (Opposite.op x_2)
                    (Opposite.op x_3))))).symm.unop.hom