∀ {B : Type u₁} [inst : CategoryTheory.Bicategory B] {C : Type u₂} [inst_1 : CategoryTheory.Bicategory C]
  {F G : CategoryTheory.Pseudofunctor B C} (self : F.StrongTrans G) {a b : B} {f g : a ⟶ b} (η : f ⟶ g)
  {Z : F.obj a ⟶ G.obj b} (h : CategoryTheory.CategoryStruct.comp (self.app a) (G.map g) ⟶ Z),
  CategoryTheory.CategoryStruct.comp (CategoryTheory.Bicategory.whiskerRight (F.map₂ η) (self.app b))
      (CategoryTheory.CategoryStruct.comp (self.naturality g).hom h) =
    CategoryTheory.CategoryStruct.comp (self.naturality f).hom
      (CategoryTheory.CategoryStruct.comp (CategoryTheory.Bicategory.whiskerLeft (self.app a) (G.map₂ η)) h)