∀ {B : Type u_1} [inst : CategoryTheory.Bicategory B] {a b : Bᵒᵖ} {f g : a ⟶ b} (η : f ⟶ g),
  Bicategory.Opposite.op2 (CategoryTheory.Bicategory.whiskerRight η.unop2 (CategoryTheory.CategoryStruct.id a).unop) =
    CategoryTheory.CategoryStruct.comp (CategoryTheory.Bicategory.rightUnitor f.unop).op2_unop.hom
      (CategoryTheory.CategoryStruct.comp η (CategoryTheory.Bicategory.rightUnitor g.unop).op2_unop.inv)