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