∀ (C : Type u_1) [inst : CategoryTheory.Category.{u_2, u_1} C] [inst_1 : CategoryTheory.MonoidalCategory C]
  {X Y Z : C × C × C} (f : X ⟶ Y) (g : Y ⟶ Z),
  CategoryTheory.MonoidalCategoryStruct.tensorHom (CategoryTheory.CategoryStruct.comp f g).1
      (CategoryTheory.MonoidalCategoryStruct.tensorHom (CategoryTheory.CategoryStruct.comp f g).2.1
        (CategoryTheory.CategoryStruct.comp f g).2.2) =
    CategoryTheory.CategoryStruct.comp
      (CategoryTheory.MonoidalCategoryStruct.tensorHom f.1
        (CategoryTheory.MonoidalCategoryStruct.tensorHom f.2.1 f.2.2))
      (CategoryTheory.MonoidalCategoryStruct.tensorHom g.1
        (CategoryTheory.MonoidalCategoryStruct.tensorHom g.2.1 g.2.2))