∀ {C : Type u_1} {D : Type u_2} [inst : CategoryTheory.Category.{v_1, u_1} C]
  [inst_1 : CategoryTheory.Category.{v_2, u_2} D] [inst_2 : CategoryTheory.MonoidalCategory C]
  [inst_3 : CategoryTheory.MonoidalCategory.MonoidalLeftAction C D] {x y : C} (f : x ⟶ y)
  [inst_4 : CategoryTheory.IsIso f] (z : D) {Z : D}
  (h : CategoryTheory.MonoidalCategory.MonoidalLeftActionStruct.actionObj x z ⟶ Z),
  CategoryTheory.CategoryStruct.comp (CategoryTheory.MonoidalCategory.MonoidalLeftActionStruct.actionHomLeft f z)
      (CategoryTheory.CategoryStruct.comp
        (CategoryTheory.MonoidalCategory.MonoidalLeftActionStruct.actionHomLeft (CategoryTheory.inv f) z) h) =
    h