∀ {B : Type u_1} [inst : CategoryTheory.Bicategory B] {a b c : Bᵒᵖ} {f g h : a ⟶ b} (η : f ⟶ g) (θ : g ⟶ h) (i : b ⟶ c),
  Bicategory.Opposite.op2
      (CategoryTheory.Bicategory.whiskerLeft i.unop (CategoryTheory.CategoryStruct.comp η θ).unop2) =
    CategoryTheory.CategoryStruct.comp (Bicategory.Opposite.op2 (CategoryTheory.Bicategory.whiskerLeft i.unop η.unop2))
      (Bicategory.Opposite.op2 (CategoryTheory.Bicategory.whiskerLeft i.unop θ.unop2))