∀ {C : Type u_2} [inst : CategoryTheory.Category.{u_1, u_2} C] [inst_1 : CategoryTheory.MonoidalCategory C]
  {D : Type u_4} [inst_2 : CategoryTheory.Category.{u_3, u_4} D] [inst_3 : CategoryTheory.MonoidalCategory D]
  (F : CategoryTheory.Functor C D) [inst_4 : F.LaxMonoidal]
  [inst_5 : ∀ (X Y : C), CategoryTheory.IsIso (CategoryTheory.Functor.LaxMonoidal.μ F X Y)] {X Y : C} (X' : C)
  (f : X ⟶ Y),
  CategoryTheory.CategoryStruct.comp (CategoryTheory.MonoidalCategoryStruct.whiskerLeft (F.obj X') (F.map f))
      (CategoryTheory.asIso (CategoryTheory.Functor.LaxMonoidal.μ F X' Y)).hom =
    CategoryTheory.CategoryStruct.comp (CategoryTheory.asIso (CategoryTheory.Functor.LaxMonoidal.μ F X' X)).hom
      (F.map (CategoryTheory.MonoidalCategoryStruct.whiskerLeft X' f))