∀ {B : Type u₁} [inst : CategoryTheory.Bicategory B] {C : Type u₂} [inst_1 : CategoryTheory.Bicategory C]
  {F G : CategoryTheory.OplaxFunctor B C} (η : CategoryTheory.Oplax.OplaxTrans F G) {a b c : B} {a' : C} (f : a ⟶ b)
  (g : b ⟶ c) (h : G.obj c ⟶ a') {Z : F.obj a ⟶ a'}
  (h_1 :
    CategoryTheory.CategoryStruct.comp (η.app a)
        (CategoryTheory.CategoryStruct.comp (CategoryTheory.CategoryStruct.comp (G.map f) (G.map g)) h) ⟶
      Z),
  CategoryTheory.CategoryStruct.comp
      (CategoryTheory.Bicategory.whiskerRight (η.naturality (CategoryTheory.CategoryStruct.comp f g)) h)
      (CategoryTheory.CategoryStruct.comp
        (CategoryTheory.Bicategory.associator (η.app a) (G.map (CategoryTheory.CategoryStruct.comp f g)) h).hom
        (CategoryTheory.CategoryStruct.comp
          (CategoryTheory.Bicategory.whiskerLeft (η.app a) (CategoryTheory.Bicategory.whiskerRight (G.mapComp f g) h))
          h_1)) =
    CategoryTheory.CategoryStruct.comp
      (CategoryTheory.Bicategory.whiskerRight (CategoryTheory.Bicategory.whiskerRight (F.mapComp f g) (η.app c)) h)
      (CategoryTheory.CategoryStruct.comp
        (CategoryTheory.Bicategory.whiskerRight (CategoryTheory.Bicategory.associator (F.map f) (F.map g) (η.app c)).hom
          h)
        (CategoryTheory.CategoryStruct.comp
          (CategoryTheory.Bicategory.associator (F.map f) (CategoryTheory.CategoryStruct.comp (F.map g) (η.app c))
              h).hom
          (CategoryTheory.CategoryStruct.comp
            (CategoryTheory.Bicategory.whiskerLeft (F.map f)
              (CategoryTheory.Bicategory.whiskerRight (η.naturality g) h))
            (CategoryTheory.CategoryStruct.comp
              (CategoryTheory.Bicategory.associator (F.map f) (CategoryTheory.CategoryStruct.comp (η.app b) (G.map g))
                  h).inv
              (CategoryTheory.CategoryStruct.comp
                (CategoryTheory.Bicategory.whiskerRight
                  (CategoryTheory.Bicategory.associator (F.map f) (η.app b) (G.map g)).inv h)
                (CategoryTheory.CategoryStruct.comp
                  (CategoryTheory.Bicategory.whiskerRight
                    (CategoryTheory.Bicategory.whiskerRight (η.naturality f) (G.map g)) h)
                  (CategoryTheory.CategoryStruct.comp
                    (CategoryTheory.Bicategory.whiskerRight
                      (CategoryTheory.Bicategory.associator (η.app a) (G.map f) (G.map g)).hom h)
                    (CategoryTheory.CategoryStruct.comp
                      (CategoryTheory.Bicategory.associator (η.app a)
                          (CategoryTheory.CategoryStruct.comp (G.map f) (G.map g)) h).hom
                      h_1))))))))