∀ {C : Type u₁} [inst : CategoryTheory.Category.{v₁, u₁} C] [inst_1 : CategoryTheory.MonoidalCategory C] {D : Type u₂}
  [inst_2 : CategoryTheory.Category.{v₂, u₂} D] [inst_3 : CategoryTheory.MonoidalCategory D] {C' : Type u₁'}
  [inst_4 : CategoryTheory.Category.{v₁', u₁'} C'] (F : CategoryTheory.Functor C D) [inst_5 : F.Monoidal]
  (G : CategoryTheory.Functor D C'),
  CategoryTheory.CategoryStruct.comp (G.map (CategoryTheory.Functor.OplaxMonoidal.η F))
      (G.map (CategoryTheory.Functor.LaxMonoidal.ε F)) =
    CategoryTheory.CategoryStruct.id (G.obj (F.obj (CategoryTheory.MonoidalCategoryStruct.tensorUnit C)))