∀ (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 C D] (x x_1 x_2 : Cᵒᵖ) (x_3 : Dᵒᵖ),
  CategoryTheory.CategoryStruct.comp
      (CategoryTheory.MonoidalCategory.MonoidalLeftActionStruct.actionHomLeft
          (CategoryTheory.MonoidalCategoryStruct.associator x x_1 x_2).hom.unop (Opposite.unop x_3)).op
      (CategoryTheory.CategoryStruct.comp
        (CategoryTheory.MonoidalCategory.MonoidalLeftActionStruct.actionAssocIso (Opposite.unop x)
                (Opposite.unop (CategoryTheory.MonoidalCategoryStruct.tensorObj x_1 x_2))
                (Opposite.unop x_3)).symm.op.hom
        (CategoryTheory.MonoidalCategory.MonoidalLeftActionStruct.actionHomRight (Opposite.unop x)
            (CategoryTheory.MonoidalCategory.MonoidalLeftActionStruct.actionAssocIso (Opposite.unop x_1)
                      (Opposite.unop x_2) (Opposite.unop x_3)).symm.op.hom.unop).op) =
    CategoryTheory.CategoryStruct.comp
      (CategoryTheory.MonoidalCategory.MonoidalLeftActionStruct.actionAssocIso
              (Opposite.unop (CategoryTheory.MonoidalCategoryStruct.tensorObj x x_1)) (Opposite.unop x_2)
              (Opposite.unop x_3)).symm.op.hom
      (CategoryTheory.MonoidalCategory.MonoidalLeftActionStruct.actionAssocIso (Opposite.unop x) (Opposite.unop x_1)
              (Opposite.unop
                (Opposite.op
                  (CategoryTheory.MonoidalCategory.MonoidalLeftActionStruct.actionObj (Opposite.unop x_2)
                    (Opposite.unop x_3))))).symm.op.hom